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))`
