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A thin but rigid semicircular wire frame...

A thin but rigid semicircular wire frame of radius r is hinged at O and can rotate in its own vertical plane. A smooth peg P starts from O and moves horizontally with constant speed `v_( 0) ,` lifting the frame upward as shown in figure

Find the angular velocity `omega` of the frame when its diameter makes an angle of `60^(@)` with the vertical :

A

`v _(0) //r`

B

`v _(2) //2r `

C

`2 v _(2) //r `

D

`v _(0)r`

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The correct Answer is:
A
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