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A stone tied to a string of length L is ...

A stone tied to a string of length L is whirled in a vertical circle, with the other end of the string at the centre. At a certain instant of time, the stone is at its lowest position, and has a speed u. The magnitude of change in its velocity as it reaches a position, where the string is horizontal is

A

`sqrt( u^2 -2 gL)`

B

`sqrt(2gL)`

C

`sqrt(u^2 - gL)`

D

`sqrt(2(u^2 -gL))`

Text Solution

Verified by Experts

The correct Answer is:
D
`sqrt(2(u^2 -gL))`
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