
The figure shows a smooth circular path of radius R in the vertical plane which subtends an angle (
) at O. A block of mass 'm' is tacken from position A to B under the action of a constant horiontal force F.
(A) find the work done by this force.
(B) in part (a) if the block is being pulled by a force F which is always tangential to the surface, find the work done by the force between A and B.




