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A ball A is thrown up vertically with a ...

A ball `A` is thrown up vertically with a speed `u` and at the same instant another ball `B` is released from a height `h`. At time `t`, the speed `A` relative to `B` is

A

`u`

B

`u - 2g t`

C

`sqrt(u^2 - 2gh)`

D

`u - g t`

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The correct Answer is:
B
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