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COM in Collision and Explosion

A ball of mas...

Question

A ball of mass 'm' moves normal to a wall with a velocity 'u' and rebounds with the same speed. The change in momentum of the ball during the rebounding is

2mu towards the wall

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2mu away from the wall

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zero

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mu away from the wall

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Solution

The correct option is A 2mu away from the wall
If the collision of the ball and the wall is elastic one then the change in the momentum of the ball after collision is $= m u - (- m u) = 2 m u$ away from the wall.

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