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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`

A

`h gt h', v' gt v`

B

`h' gt h, v' gt v`

C

`h'=h, v'lt v`

D

`h'=h,v'=v`

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The correct Answer is:
B
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