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.

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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 = ms^(-1)`

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