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A bob hangs from a rigid support by an i...

A bob hangs from a rigid support by an inextensible string of length l. It is released from rest when string makes an agngle `60^(@)` with vertical . The speed of the bob at the lowest position is

A

`sqrt( gl)`

B

`sqrt( 3gl)`

C

`sqrt( 2gl)`

D

`sqrt( 5gl)`

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The correct Answer is:
A
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