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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 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.

A

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

B

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

C

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

D

`sqrt(2gl)`

Text Solution

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The correct Answer is:
A
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