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

A stone is tied to a string of length L and 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 velocity as it reaches a horizontal position is

A

`sqrt (u^2 - 2gL)`

B

`sqrt (2g L )`

C

`sqrt (u^2-gL)`

D

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

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