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An agent applies force of constant magni...

An agent applies force of constant magnitude `F_(0)` always in the tangential direction as shown in the figure`-3.77`. Find the speed of the bob when string becomes horizontal, assuming that it is at rest at its lowest point:

A

`sqrt((l)/(m)(piF_(0)-2mg))`

B

`sqrt(lg)`

C

`sqrt((l)/(m)(piF_(0))-4mg)`

D

`sqrt((l)/(m)F_(0))`

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The correct Answer is:
A
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