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 away from the wall
mu away from the wall
zero
2mu towards the wall
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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