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

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v=4 m/s

v=8 m/s

v=1 m/s

v=2 m/s

answer is A.

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Detailed Solution

The speed of the wall will not change after the collision. Let v be the velocity of the ball after collision in the direction. Since collision is elastic (e=1) . Speed of separation speed = Speed of approach Or v−1=2+1 or v=4m/s

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