Question

A ball of mass m moves towards a moving wall of infinite mass with a speed 'v' along the normal to the wall. The speed of the wall is 'u' toward the ball. The speed of the ball after elastic collision with wall is

A

away from the wall

B

away from the wall

C

away from the wall

D

away from the wall

Hard
Updated on : 2022-09-05
Solution
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Correct option is B)

In the frame of wall, the ball moves towards it with speed and due to momentum conservation velocity after collision returns with velocity in the direction in which wall is moving. 
So from the ground frame, the velocity of ball after collision with wall is

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