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The velocity of a particle at an instant is 10ms-1. After 5 s, the velocity of the particle is 20ms-1. The
velocity at 3 s before the given instant is -
velocity at 3 s before the given instant is -
- a)4ms-1
- b)6ms-1
- c)7ms-1
- d)8ms-1
Correct answer is option 'A'. Can you explain this answer?
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Most Upvoted Answer
The velocity of a particle at an instant is 10ms-1. After 5 s, the vel...
Here, u=10m/s v=20m/s t=5s then, acceleration,a=v-
u/t =20-10/5=2m/s^2 now, velocity before 3s ie.t'=t-3=2s by using, v=u'+at...(u'=initial velocity at rest) v=0+2*2 v=4m/s.
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The velocity of a particle at an instant is 10ms-1. After 5 s, the vel...
Given Information:
- Initial velocity of the particle: 10 ms-1
- Final velocity of the particle after 5 s: 20 ms-1
Calculating Acceleration:
- Using the formula:
v = u + at
where v is the final velocity, u is the initial velocity, a is acceleration, and t is time
- Substituting the given values:
20 = 10 + a(5)
a = 2 ms-2
Calculating Velocity at 3 s before the given instant:
- Using the formula:
v = u + at
- Substituting the values:
v = 10 + (-2)(-3) (as acceleration is in the opposite direction of velocity)
v = 10 + 6
v = 16 ms-1
Conclusion:
- The velocity of the particle at 3 s before the given instant is 16 ms-1, which is not provided in the options.
- Therefore, the correct answer should be the closest option, which is 4 ms-1 (option A).
- Initial velocity of the particle: 10 ms-1
- Final velocity of the particle after 5 s: 20 ms-1
Calculating Acceleration:
- Using the formula:
v = u + at
where v is the final velocity, u is the initial velocity, a is acceleration, and t is time
- Substituting the given values:
20 = 10 + a(5)
a = 2 ms-2
Calculating Velocity at 3 s before the given instant:
- Using the formula:
v = u + at
- Substituting the values:
v = 10 + (-2)(-3) (as acceleration is in the opposite direction of velocity)
v = 10 + 6
v = 16 ms-1
Conclusion:
- The velocity of the particle at 3 s before the given instant is 16 ms-1, which is not provided in the options.
- Therefore, the correct answer should be the closest option, which is 4 ms-1 (option A).
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The velocity of a particle at an instant is 10ms-1. After 5 s, the velocity of the particle is 20ms-1. Thevelocity at 3 s before the given instant is -a)4ms-1b)6ms-1c)7ms-1d)8ms-1Correct answer is option 'A'. Can you explain this answer?
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