Work, Energy and Power-2 Practice Questions - DPP for NEET

 Page 1


DIRECTIONS (Q.1-Q.20) : There are 20 multiple choice
questions. Each question has 4 choices (a), (b), (c) and (d), out
of which ONLY ONE choice is correct.
Q.1 A rifle man, who together with his rifle has a mass of 100
kg, stands on a smooth surface fires 10 shots horizontally.
Each bullet has a mass 10 gm and a muzzle velocity of 800
m/s. What velocity does rifle man acquire at the end of 10
shots
(a) 0.8 m/s (b) 0.5 m/s (c) 0.3 m/s (d) 1.2 m/s
Q.2 A bullet of mass 10 g travelling horizontally with a velocity of
300 m/s strikes a block of wood of mass 290 g which rests
on a rough horizontal floor. After impact the block and the
bullet move together and come to rest when the block has
travelled a distance of 15 m. The coefficient of friction
between the block and the floor will be - (Duration of
impact is very short)
(a)
2
1
(b)
3
2
(c)
3
1
(d)
4
3
Q.3 A 20 g bullet pierces through a plate of mass m
1
 = 1 kg and
then comes to rest inside a second plate of mass m
2
 = 2.98
kg. It is found that the two plates, initially at rest, now move
with equal velocities. The percentage loss in the initial
velocity of bullet when it is between m
1
 and m
2
. (Neglect
any loss of material of the bodies, due to action of bullet.)
will be -
(a) 20% (b) 25%
(c) 30% (d) 45%
Page 2


DIRECTIONS (Q.1-Q.20) : There are 20 multiple choice
questions. Each question has 4 choices (a), (b), (c) and (d), out
of which ONLY ONE choice is correct.
Q.1 A rifle man, who together with his rifle has a mass of 100
kg, stands on a smooth surface fires 10 shots horizontally.
Each bullet has a mass 10 gm and a muzzle velocity of 800
m/s. What velocity does rifle man acquire at the end of 10
shots
(a) 0.8 m/s (b) 0.5 m/s (c) 0.3 m/s (d) 1.2 m/s
Q.2 A bullet of mass 10 g travelling horizontally with a velocity of
300 m/s strikes a block of wood of mass 290 g which rests
on a rough horizontal floor. After impact the block and the
bullet move together and come to rest when the block has
travelled a distance of 15 m. The coefficient of friction
between the block and the floor will be - (Duration of
impact is very short)
(a)
2
1
(b)
3
2
(c)
3
1
(d)
4
3
Q.3 A 20 g bullet pierces through a plate of mass m
1
 = 1 kg and
then comes to rest inside a second plate of mass m
2
 = 2.98
kg. It is found that the two plates, initially at rest, now move
with equal velocities. The percentage loss in the initial
velocity of bullet when it is between m
1
 and m
2
. (Neglect
any loss of material of the bodies, due to action of bullet.)
will be -
(a) 20% (b) 25%
(c) 30% (d) 45%
2
DPP/ P 13
Q.4 A bullet of mass 20 g hits a block of mass 1.98 kg suspended
from a massless string of length 100 cm and sticks to it.
The bullet flies down at an angle of 30º to the horizontal
with a velocity of 200 m/s. Through what height the block
will rise-
(a) 0.15 m
(b) 0.30 m
v
30°
M
h
(M+m)
(c) 0.45 m
(d) 0.75 m
Q.5 A bullet of mass 0.01 kg travelling at a speed of 500 m/s
strikes a block of mass 2 kg, which is suspended by a string
of length 5 m. The centre of gravity of the block is found to
rise a vertical distance of 0.1 m. The speed of the bullet
after it emerges from the block will be -
(a) 1.4 m/s
(b) 110 m/s
(c) 220 m/s
u
1
m
1
m
2
v
2
0.1m
v
1
(d) 14 m/s
Q.6 The rate of burning of fuel in a rocket is 50 gm/sec. and
comes out with and velocity 4 × 10
3 
m/s. The force exerted
by gas on rocket will be -
(a) 200 N (b) 250 N
(c) 2.5 × 10
6 
N (d) 2.5 × 10
4 
N
Q.7 A body of mass 1 kg strikes elastically with another body at
rest and continues to move in the same direction with one
fourth of its initial velocity . The mass of the other body is -
(a) 0.6 kg (b) 2.4 kg (c) 3 kg (d) 4 kg
Q.8 A ball moving with a speed of 9 m/s strikes with an identical
stationary ball such that after the collision the direction of
each ball makes an angle of 30° with the original line of
motion. Find the speeds of the two balls after the  collision.
Is the kinetic energy conserved in this collision process ?
(a)3 3 m/s, no (b)3 3 m/s, no
(c)6 3 m/s, yes (d) 0, yes
Q.9 The mass of a rocket is 500 kg and the relative velocity of
the gases ejecting from it is 250 m/s with respect to the
rocket. The rate of burning of the fuel in order to give the
rocket an initial acceleration 20 m/s
2
 in the vertically
upward direction (g = 10 m/s
2
), will be -
(a) 30 kg/s (b) 60 kg/s
(c) 45 kg/s (d) 10 kg/s
Q.10 A slow moving electron collides elastically with a hydrogen
atom at rest. The initial and final motions are along the
same straight line. What fraction of electron's kinetic
energy is transferred to the hydrogen atom? The mass of
hydrogen atom is 1850 times the mass of electron.
(a) 0.217 % (b) 2.17 % (c)  0.0217 % (d) 21.7 %
Q.11 A particle of mass 4 m which is at rest explodes into three
fragments, two of the fragments each of mass m are found
to move each with a speed v making an angle 90º with each
other. The total energy relased in this explosion is -
(a)
1
2
mv
2
 (b) mv
2
(c)
3
2
mv
2
(d) 2 mv
2
Q.12 A body of mass M splits into two parts aM and (1 – a) M
by an internal explosion, which generates kinetic energy T.
After explosion if the two parts move in the same direction
as before, their relative speed will be  -
(a)
T
(1 )M -a
(b)
2T
(1 )M a -a
(c)
T
2(1 )M -a
(d)
2T
(1 )M -a
Q.13A body of mass 1 kg initially at rest explodes and breaks
into three fragments of masses in the ratio 1 : 1 : 3. The
two pieces of equal mass fly off perpendicular to each other
with a speed of 30 m/sec each. What is the velocity of the
heavier fragment ?
(a) 10 2 m/s (b) 15 2 m/s
(c)5 2 m/s (d) 20 2 m/s
Page 3


DIRECTIONS (Q.1-Q.20) : There are 20 multiple choice
questions. Each question has 4 choices (a), (b), (c) and (d), out
of which ONLY ONE choice is correct.
Q.1 A rifle man, who together with his rifle has a mass of 100
kg, stands on a smooth surface fires 10 shots horizontally.
Each bullet has a mass 10 gm and a muzzle velocity of 800
m/s. What velocity does rifle man acquire at the end of 10
shots
(a) 0.8 m/s (b) 0.5 m/s (c) 0.3 m/s (d) 1.2 m/s
Q.2 A bullet of mass 10 g travelling horizontally with a velocity of
300 m/s strikes a block of wood of mass 290 g which rests
on a rough horizontal floor. After impact the block and the
bullet move together and come to rest when the block has
travelled a distance of 15 m. The coefficient of friction
between the block and the floor will be - (Duration of
impact is very short)
(a)
2
1
(b)
3
2
(c)
3
1
(d)
4
3
Q.3 A 20 g bullet pierces through a plate of mass m
1
 = 1 kg and
then comes to rest inside a second plate of mass m
2
 = 2.98
kg. It is found that the two plates, initially at rest, now move
with equal velocities. The percentage loss in the initial
velocity of bullet when it is between m
1
 and m
2
. (Neglect
any loss of material of the bodies, due to action of bullet.)
will be -
(a) 20% (b) 25%
(c) 30% (d) 45%
2
DPP/ P 13
Q.4 A bullet of mass 20 g hits a block of mass 1.98 kg suspended
from a massless string of length 100 cm and sticks to it.
The bullet flies down at an angle of 30º to the horizontal
with a velocity of 200 m/s. Through what height the block
will rise-
(a) 0.15 m
(b) 0.30 m
v
30°
M
h
(M+m)
(c) 0.45 m
(d) 0.75 m
Q.5 A bullet of mass 0.01 kg travelling at a speed of 500 m/s
strikes a block of mass 2 kg, which is suspended by a string
of length 5 m. The centre of gravity of the block is found to
rise a vertical distance of 0.1 m. The speed of the bullet
after it emerges from the block will be -
(a) 1.4 m/s
(b) 110 m/s
(c) 220 m/s
u
1
m
1
m
2
v
2
0.1m
v
1
(d) 14 m/s
Q.6 The rate of burning of fuel in a rocket is 50 gm/sec. and
comes out with and velocity 4 × 10
3 
m/s. The force exerted
by gas on rocket will be -
(a) 200 N (b) 250 N
(c) 2.5 × 10
6 
N (d) 2.5 × 10
4 
N
Q.7 A body of mass 1 kg strikes elastically with another body at
rest and continues to move in the same direction with one
fourth of its initial velocity . The mass of the other body is -
(a) 0.6 kg (b) 2.4 kg (c) 3 kg (d) 4 kg
Q.8 A ball moving with a speed of 9 m/s strikes with an identical
stationary ball such that after the collision the direction of
each ball makes an angle of 30° with the original line of
motion. Find the speeds of the two balls after the  collision.
Is the kinetic energy conserved in this collision process ?
(a)3 3 m/s, no (b)3 3 m/s, no
(c)6 3 m/s, yes (d) 0, yes
Q.9 The mass of a rocket is 500 kg and the relative velocity of
the gases ejecting from it is 250 m/s with respect to the
rocket. The rate of burning of the fuel in order to give the
rocket an initial acceleration 20 m/s
2
 in the vertically
upward direction (g = 10 m/s
2
), will be -
(a) 30 kg/s (b) 60 kg/s
(c) 45 kg/s (d) 10 kg/s
Q.10 A slow moving electron collides elastically with a hydrogen
atom at rest. The initial and final motions are along the
same straight line. What fraction of electron's kinetic
energy is transferred to the hydrogen atom? The mass of
hydrogen atom is 1850 times the mass of electron.
(a) 0.217 % (b) 2.17 % (c)  0.0217 % (d) 21.7 %
Q.11 A particle of mass 4 m which is at rest explodes into three
fragments, two of the fragments each of mass m are found
to move each with a speed v making an angle 90º with each
other. The total energy relased in this explosion is -
(a)
1
2
mv
2
 (b) mv
2
(c)
3
2
mv
2
(d) 2 mv
2
Q.12 A body of mass M splits into two parts aM and (1 – a) M
by an internal explosion, which generates kinetic energy T.
After explosion if the two parts move in the same direction
as before, their relative speed will be  -
(a)
T
(1 )M -a
(b)
2T
(1 )M a -a
(c)
T
2(1 )M -a
(d)
2T
(1 )M -a
Q.13A body of mass 1 kg initially at rest explodes and breaks
into three fragments of masses in the ratio 1 : 1 : 3. The
two pieces of equal mass fly off perpendicular to each other
with a speed of 30 m/sec each. What is the velocity of the
heavier fragment ?
(a) 10 2 m/s (b) 15 2 m/s
(c)5 2 m/s (d) 20 2 m/s
DPP/ P 13
3
Q.14A body of mass m moving with a velocity v
1
 in the X-
direction collides with another body of mass M moving in
Y -direction with a velocity v
2
. They coalasce into one body
during collision. The magnitude and direction of  the
momentum of the final body, will be-
(a)
12
(mv) (Mv) + , tan
–1
2
1
Mv
mv
æö
ç÷
èø
(b)
12
(mv ) (Mv) + , tan
–1
1
2
Mv
mv
æö
ç÷
èø
(c)
22
12
(mv ) (Mv ) + , tan
–1
2
1
Mv
mv
æö
ç÷
èø
(d)
22
12
(mv ) (Mv ) + , tan
–1
1
2
Mv
mv
æö
ç÷
èø
Q.15 A ball of mass m hits a wall with a speed v making an angle
q with the normal. If the coefficient of restitution is e, the
direction and magnitude of the velocity of ball after
reflection from the wall will respectively be  -
(a) tan
–1
tan
e
q æö
ç÷
èø
, 
2 22
v sin e cos q+q
(b) tan
–1
e
tan
æö
ç÷
èø q
,
1
v
222
e sin cos q+q
(c) tan
–1
(e tan q), 
v
e
tan q
(d) tan
–1 
 (e tan q), 
22
vsine q+
Q.16 A tennis ball dropped from a height of 2 m rebounds only 1.5
metre after hitting the ground. What fraction of energy is lost
in the impact?
(a) 1/2 (b) 1/4 (c) 1/8 (d) 1/16
Q.17 A bullet is fired from the gun. The gun recoils, the kinetic
energy of the recoil shall be-
(a) equal to the kinetic energy of the bullet
(b) less than the kinetic energy of the bullet
(c) greater than the kinetic energy of the bullet
(d) double that of the kinetic energy of the bullet
Q.18 Conservation of linear momentum is equivalent to-
(a) Newton's second law of motion
(b) Newton's first law of motion
(c) Newton's third law of motion
(d) Conservation of angular momentum.
Q.19 In an inelastic collision-
(a) momentum is conserved but kinetic energy is not
conserved
(b) momentum is not conserved but kinetic energy is
conserved
(c) neither momentum nor kinetic energy is conserved
(d) both the momentum and kinetic energy are conserved
Q.20Inelastic collision is the-
(a) collision of ideal gas molecules with the walls of the
container
(b) collision of electron and positron to an inhilate each
other.
(c) collision of two rigid solid spheres lying on a
frictionless table
(d) scattering of a-particles with the nucleus of gold atom
DIRECTIONS (Q.21-Q.23) : In the following questions,
more than one of the answers  given are correct. Select the
correct answers and mark it according to the following
codes:
Codes :
(a) 1, 2 and 3 are correct (b) 1 and 2 are correct
(c) 2 and 4 are correct (d) 1 and 3 are correct
Q.21 Which of the following statements is false for collisions-
(1)Momentum is conserved in elastic collisions but not
in inelastic collisions.
(2)Total-kinetic energy is conserved in elastic collisions
but momentum is not conserved.
(3) Total kinetic energy and momentum both are conserved
in all types of collisions
(4)Total kinetic energy is not conserved in inelastic
collisions but momentum is conserved
Q.22 Which of the following hold when two particles of masses
m
1
 and m
2
 undergo elastic collision?
(1) When m
1
 = m
2
 and m
2
 is stationary , there is maximum
transfer of kinetic energy in head on collision
(2) When m
1
 = m
2
 and m
2
 is stationary , there is maximum
transfer of momentum in head on collision
(3)When m
1
 >> m
2
 and m
2
 is stationary, after head on
collision m
2
 moves with twice the velocity of m
1
.
(4)When the collision is oblique and m
1
 = m
2
 with m
2
stationary, after the collision the particle move in
opposite directions.
Page 4


DIRECTIONS (Q.1-Q.20) : There are 20 multiple choice
questions. Each question has 4 choices (a), (b), (c) and (d), out
of which ONLY ONE choice is correct.
Q.1 A rifle man, who together with his rifle has a mass of 100
kg, stands on a smooth surface fires 10 shots horizontally.
Each bullet has a mass 10 gm and a muzzle velocity of 800
m/s. What velocity does rifle man acquire at the end of 10
shots
(a) 0.8 m/s (b) 0.5 m/s (c) 0.3 m/s (d) 1.2 m/s
Q.2 A bullet of mass 10 g travelling horizontally with a velocity of
300 m/s strikes a block of wood of mass 290 g which rests
on a rough horizontal floor. After impact the block and the
bullet move together and come to rest when the block has
travelled a distance of 15 m. The coefficient of friction
between the block and the floor will be - (Duration of
impact is very short)
(a)
2
1
(b)
3
2
(c)
3
1
(d)
4
3
Q.3 A 20 g bullet pierces through a plate of mass m
1
 = 1 kg and
then comes to rest inside a second plate of mass m
2
 = 2.98
kg. It is found that the two plates, initially at rest, now move
with equal velocities. The percentage loss in the initial
velocity of bullet when it is between m
1
 and m
2
. (Neglect
any loss of material of the bodies, due to action of bullet.)
will be -
(a) 20% (b) 25%
(c) 30% (d) 45%
2
DPP/ P 13
Q.4 A bullet of mass 20 g hits a block of mass 1.98 kg suspended
from a massless string of length 100 cm and sticks to it.
The bullet flies down at an angle of 30º to the horizontal
with a velocity of 200 m/s. Through what height the block
will rise-
(a) 0.15 m
(b) 0.30 m
v
30°
M
h
(M+m)
(c) 0.45 m
(d) 0.75 m
Q.5 A bullet of mass 0.01 kg travelling at a speed of 500 m/s
strikes a block of mass 2 kg, which is suspended by a string
of length 5 m. The centre of gravity of the block is found to
rise a vertical distance of 0.1 m. The speed of the bullet
after it emerges from the block will be -
(a) 1.4 m/s
(b) 110 m/s
(c) 220 m/s
u
1
m
1
m
2
v
2
0.1m
v
1
(d) 14 m/s
Q.6 The rate of burning of fuel in a rocket is 50 gm/sec. and
comes out with and velocity 4 × 10
3 
m/s. The force exerted
by gas on rocket will be -
(a) 200 N (b) 250 N
(c) 2.5 × 10
6 
N (d) 2.5 × 10
4 
N
Q.7 A body of mass 1 kg strikes elastically with another body at
rest and continues to move in the same direction with one
fourth of its initial velocity . The mass of the other body is -
(a) 0.6 kg (b) 2.4 kg (c) 3 kg (d) 4 kg
Q.8 A ball moving with a speed of 9 m/s strikes with an identical
stationary ball such that after the collision the direction of
each ball makes an angle of 30° with the original line of
motion. Find the speeds of the two balls after the  collision.
Is the kinetic energy conserved in this collision process ?
(a)3 3 m/s, no (b)3 3 m/s, no
(c)6 3 m/s, yes (d) 0, yes
Q.9 The mass of a rocket is 500 kg and the relative velocity of
the gases ejecting from it is 250 m/s with respect to the
rocket. The rate of burning of the fuel in order to give the
rocket an initial acceleration 20 m/s
2
 in the vertically
upward direction (g = 10 m/s
2
), will be -
(a) 30 kg/s (b) 60 kg/s
(c) 45 kg/s (d) 10 kg/s
Q.10 A slow moving electron collides elastically with a hydrogen
atom at rest. The initial and final motions are along the
same straight line. What fraction of electron's kinetic
energy is transferred to the hydrogen atom? The mass of
hydrogen atom is 1850 times the mass of electron.
(a) 0.217 % (b) 2.17 % (c)  0.0217 % (d) 21.7 %
Q.11 A particle of mass 4 m which is at rest explodes into three
fragments, two of the fragments each of mass m are found
to move each with a speed v making an angle 90º with each
other. The total energy relased in this explosion is -
(a)
1
2
mv
2
 (b) mv
2
(c)
3
2
mv
2
(d) 2 mv
2
Q.12 A body of mass M splits into two parts aM and (1 – a) M
by an internal explosion, which generates kinetic energy T.
After explosion if the two parts move in the same direction
as before, their relative speed will be  -
(a)
T
(1 )M -a
(b)
2T
(1 )M a -a
(c)
T
2(1 )M -a
(d)
2T
(1 )M -a
Q.13A body of mass 1 kg initially at rest explodes and breaks
into three fragments of masses in the ratio 1 : 1 : 3. The
two pieces of equal mass fly off perpendicular to each other
with a speed of 30 m/sec each. What is the velocity of the
heavier fragment ?
(a) 10 2 m/s (b) 15 2 m/s
(c)5 2 m/s (d) 20 2 m/s
DPP/ P 13
3
Q.14A body of mass m moving with a velocity v
1
 in the X-
direction collides with another body of mass M moving in
Y -direction with a velocity v
2
. They coalasce into one body
during collision. The magnitude and direction of  the
momentum of the final body, will be-
(a)
12
(mv) (Mv) + , tan
–1
2
1
Mv
mv
æö
ç÷
èø
(b)
12
(mv ) (Mv) + , tan
–1
1
2
Mv
mv
æö
ç÷
èø
(c)
22
12
(mv ) (Mv ) + , tan
–1
2
1
Mv
mv
æö
ç÷
èø
(d)
22
12
(mv ) (Mv ) + , tan
–1
1
2
Mv
mv
æö
ç÷
èø
Q.15 A ball of mass m hits a wall with a speed v making an angle
q with the normal. If the coefficient of restitution is e, the
direction and magnitude of the velocity of ball after
reflection from the wall will respectively be  -
(a) tan
–1
tan
e
q æö
ç÷
èø
, 
2 22
v sin e cos q+q
(b) tan
–1
e
tan
æö
ç÷
èø q
,
1
v
222
e sin cos q+q
(c) tan
–1
(e tan q), 
v
e
tan q
(d) tan
–1 
 (e tan q), 
22
vsine q+
Q.16 A tennis ball dropped from a height of 2 m rebounds only 1.5
metre after hitting the ground. What fraction of energy is lost
in the impact?
(a) 1/2 (b) 1/4 (c) 1/8 (d) 1/16
Q.17 A bullet is fired from the gun. The gun recoils, the kinetic
energy of the recoil shall be-
(a) equal to the kinetic energy of the bullet
(b) less than the kinetic energy of the bullet
(c) greater than the kinetic energy of the bullet
(d) double that of the kinetic energy of the bullet
Q.18 Conservation of linear momentum is equivalent to-
(a) Newton's second law of motion
(b) Newton's first law of motion
(c) Newton's third law of motion
(d) Conservation of angular momentum.
Q.19 In an inelastic collision-
(a) momentum is conserved but kinetic energy is not
conserved
(b) momentum is not conserved but kinetic energy is
conserved
(c) neither momentum nor kinetic energy is conserved
(d) both the momentum and kinetic energy are conserved
Q.20Inelastic collision is the-
(a) collision of ideal gas molecules with the walls of the
container
(b) collision of electron and positron to an inhilate each
other.
(c) collision of two rigid solid spheres lying on a
frictionless table
(d) scattering of a-particles with the nucleus of gold atom
DIRECTIONS (Q.21-Q.23) : In the following questions,
more than one of the answers  given are correct. Select the
correct answers and mark it according to the following
codes:
Codes :
(a) 1, 2 and 3 are correct (b) 1 and 2 are correct
(c) 2 and 4 are correct (d) 1 and 3 are correct
Q.21 Which of the following statements is false for collisions-
(1)Momentum is conserved in elastic collisions but not
in inelastic collisions.
(2)Total-kinetic energy is conserved in elastic collisions
but momentum is not conserved.
(3) Total kinetic energy and momentum both are conserved
in all types of collisions
(4)Total kinetic energy is not conserved in inelastic
collisions but momentum is conserved
Q.22 Which of the following hold when two particles of masses
m
1
 and m
2
 undergo elastic collision?
(1) When m
1
 = m
2
 and m
2
 is stationary , there is maximum
transfer of kinetic energy in head on collision
(2) When m
1
 = m
2
 and m
2
 is stationary , there is maximum
transfer of momentum in head on collision
(3)When m
1
 >> m
2
 and m
2
 is stationary, after head on
collision m
2
 moves with twice the velocity of m
1
.
(4)When the collision is oblique and m
1
 = m
2
 with m
2
stationary, after the collision the particle move in
opposite directions.
4
DPP/ P 13
Q.23Two balls at the same temperature collide inelastically.
Which of the following is not conserved?
(1) Kinetic energy (2) Velocity
(3) Temperature (4) Momentum
DIRECTIONS (Q.24-Q.26) : Read the passage given below
and answer the questions that follows :
A small particle of mass m/10 is moving horizontally at a height
of 3R/2 from ground with velocity 10 m/s. A perfectly inelastic
collision occurs at point P of sphere of mass m placed on smooth
horizontal surface. The radius of sphere is R. (m = 10 kg and R =
0.1 m) (Assume all surfaces to be smooth).
B
R
m
R/2
P
10 m/s
m/10
Q.24 Speed of particle just after collision is
(a) approx 5.0 m/s (b) approx 10 m/s
(c) approx. 15.0 m/s (d) approx 20.0 m/s
Q.25 Speed of sphere just after collision is
(a) 27/43 m/s (b) 30/43 m/s
(c) 35/43 m/s (d) 40/43 m/s
Q.26 Angular speed of sphere just after collision is
(a) zero (b) 2 rad/sec
(c) 2.5 rad/sec (d) 3 rad/sec
DIRECTIONS (Q. 27-Q.28) : Each of these questions contains
two statements: Statement-1 (Assertion) and Statement-2
(Reason). Each of these questions has four alternative choices,
only one of which is the correct answer. You have to select the
correct choice.
(a) Statement-1 is True, Statement-2 is True; Statement-2 is a
correct explanation for  Statement-1.
(b) Statement-1 is True, Statement-2 is True; Statement-2 is
NOT a correct explanation for Statement-1.
(c) Statement -1 is False, Statement-2 is True.
(d) Statement -1 is True, Statement-2 is False.
Q.27 A particle of mass m strikes a wedge of mass M horizontally
as shown in the figure.
m
M
Statement - 1  : If collision is perfectly inelastic then, it
can be concluded that the particle sticks to the wedge.
Statement - 2  : In perfectly inelastic collision velocity of
both bodies is same along common normal just after
collision.
Q.28Statement - 1 : In an elastic collision in one dimension
between two bodies, total momentum remains the same
before, during and after the collision.
Statement - 2 : In an elastic collision in one dimension
between two bodies, total kinetic energy remains the same
before, during and after the collision.
[Assume external forces are absent in both the above
statements].