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A block of mass m at the end of a string...

A block of mass m at the end of a string is whirled round in a vertical circle of radius R. The critical speed of the block at the top of its swing below which the string would slacken before the block reaches the top is

A

`Rg`

B

`(Rg)^(2)`

C

`R//g`

D

`sqrt(Rg)`

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The correct Answer is:
D
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