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))/(Deltat)`

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

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

the kinetic energy of the ball remains the same after the collision .

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