Question

A ball of mass m approaches a wall of mass M(>>m) with speed of 4m/s along the normal to the wall. The speed of wall is 1m/s towards the ball. The speed of the ball after an elastic collision with the wall will be
(A) 5m/s away from the wall
(B) 9m/s away from the wall
(C) 3m/s away from the wall
(D) 6m/s away from the wall.

ANS is D but I need a proper solution to understand the method to solve this question.

Thanks​

Answer 1

Explanation:

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Answer 2

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