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A platform of infinite mass is moving up...

A platform of infinite mass is moving upward with velocity `5 m//s.` At time t = 0, a ball which is at height 100 m above the platform starts falling freely. The velocity of ball just after the collision will be (Assume elastic collision) `(g=10 m//s^(2)):`

A

`40 m//s`

B

`50 m//s`

C

`20m//s`

D

None

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The correct Answer is:
B
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