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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 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 its velocity , as it reach a position where the string is horizontal, is

A

`sqrt(u^2-2gL)`

B

`sqrt(2gL)`

C

`sqrt(u^2-gL)`

D

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

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