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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`. If it is displaced through a distance `l` (from the lowest position) keeping the string straight and then released. The speed of the bob at the lowest position is

A

`sqrt(gl)`

B

`sqrt(3gl)`

C

`sqrt(2gl)`

D

`sqrt(1.5 gl)`

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The correct Answer is:
A
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