A simple pendulum has a length l . What ...

A simple pendulum has a length l . What minimum velocity should be imparted to its bob at the mean position so that bob reaches a height equal to l above the point of suspension?

`sqrt gr`

`sqrt(5gl)`

`sqrt(2gl)`

`sqrt((l)/(g))`

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The correct Answer is:

`v_(L)=sqrt(5 gr)`.

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