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 lowest position and has a speed `u` . Find the magnitude of the change in its velocity as it reaches a position, where the string is horizontal.

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

`sqrt(2gL)`

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

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

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