A pendulum consists of a small ball that has a mass m suspended on a light long

Question

A pendulum consists of a small ball that has a mass m suspended on a light long string of length l. Initially, the pendulum is held at rest so that the string is taut and makes an angle ? with the vertical. The pendulum is then released.

Part 1. By the time the pendulum passes through the equilibrium position, what is the amount of work done by the force of tension on the ball?
(A)mgl cos?
(B)mgl(1- cos?)
(C)mgl sin?
(D)mgl (1- sin?)
(E)zero

Part 2. By the time the pendulum passes through the equilibrium position, what is the amount of work done by the force of gravity on the ball?
(A)mgl cos?
(B)mgl(1- cos?)
(C)mgl sin?
(D)mgl (1- sin?)
(E)zero

Explanation / Answer

part 1, answer is 0 because tension is always perpendicular to the mostion of the ball

part 2 mgl(1-cos) option B

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