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An L shaped frame is free to rotate in a...

An L shaped frame is free to rotate in a vertical plane about a horizontal axis passing through a smooth hinge O. Each side of the frame has a length L and mass m. Frame is let to fall with one side horizontal and the other vertical.

With what speed the end A will strike the ground ?

A

`sqrt(gL)`

B

`2sqrt(gL)`

C

`3.2 sqrt(gL)`

D

`1.6 sqrt(gL)`

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The correct Answer is:
A
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