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

A

2mu towards the wall

B

2mu away from the wall

C

zero

D

mu away from the wall

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Solution

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If the collision of the ball and the wall is elastic one then the change in the momentum of the ball after collision is =mu−(−mu)=2mu away from the wall.

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