A ball moving with a velocity v hits a m...

A ball moving with a velocity `v` hits a massive wall moving towards the ball with a velocity a. An elastic impact lasts for time `/_\t`

The average elastic force acting on the ball is `(m(u+v))/(Delta t)`

The average elastic force acting on the ball is `2m((u+v))/(Delta t)`

the kinetic energy of the ball increases by 2mu (u + v)

the kinetic energy of the ball does not change

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B, C

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