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**Q.1. A ball is thrown vertically downward with a velocity of 20m/s from the top of a tower. It hits the ground after some time with a velocity of 80m/s. The height of the tower is : (g = 10m/s ^{2}) [2020]**

v

(80)

6400 – 400 = 2 × (–10) × s

s = – 300 m

Height of tower h = 300 m

A:

B:

C: t

D:

Ans:

As we learnt in

Case of Relative velocity -

When A & B are moving along with straight line in opposite direction.

Relative velocity of A with respect to B is.

A: Velocity is perpendicular to r and acceleration is directed away from the origin.

B: Velocity and acceleration both are perpendicular to r

C: Velocity is acceleration both are parallel to r

D: Velocity is perpendicular to r and acceleration is directed towards the origin. [2016]

Ans:

A: A/2 + B/3

B: 3A/2 + B

C: 3A + 7B

D: 3A/2 + 7B/3

Ans:

A: -2nβ

B: -2nβ

C: -2nβ

D: -2nβ

Ans:

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