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A ping-pong ball of mass `m` is floating in air by a jet of water emerging out of a nozzle. If the water strikes the ping-gong ball with a speed `v` and just after collision water falls dead, the rate of flow of water in the nozzle is equal to

A

`(2mg)/(v)`

B

`(mv)/(g)`

C

`(mg)/(v)`

D

None of these

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The correct Answer is:
B
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