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A ball is moving with velocity 2m//s tow...

A ball is moving with velocity `2m//s` towards a heavy wall moving towards the ball with speed `1m//s` as shown in figure. Assuming collision to be elastic, find the velocity of ball immediately after the collision.

A

`v=4m//s`

B

`v=3m//s`

C

`v=0 m//s`

D

`v=1m//s`

Text Solution

Verified by Experts

The correct Answer is:
A
The speed of wall will not change after the collision. So, let v be the velocity of the ball after collision in the direction shown in figure.

Since, collision is elastic `(e=1)`.
separation speed=approach speed
or `v-1=2+1`
or `v=4m//s`
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