A ball is hanging vertically by a light inextensible string of length L from fixed point O. The ball of mass m is given a speed u at the lowest position such that it completes a vertical circle with centre at O as shown. Let AB be a diameter of circular path of ball making an angle θ with vertical as shown. (g is acceleration due to gravity)
While the ball moves from B to A.
(A) work done by all the forces on ball is zero.
(B) Its mechnaical energy is conserved.
(C) Its total energy is conserved.
(D) Work done by Tension on the ball is zero
