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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 top of its swing below which the string would slacken before the block reaches the bottom is?

A

`sqrt(5Rg)`

B

`sqrt(3Rg)`

C

`sqrt(2Rg)`

D

`sqrt(Rg)`

Text Solution

Verified by Experts

The correct Answer is:
D
`mg=(mv_(min)^(2))/(R)"or v"_(min)=sqrt(Rg)` (at topmost point)
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