A ball of mass 'm' approaches a wall of mass 'M'(>>m) with speed 6 m/s along the normal to the wall. The speed of wall is 2 m/s towards the ball. The speed of the ball after an elastic collision with the wall is

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4 m/s away from the wall

6 m/s away from the wall

10 m/s away from the wall

2 m/s away from the wall

answer is C.

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