Work Done by String Tension in Pendulum · CAP 2001 #9
Physics · mechanics
Problem
A simple pendulum, consisting of a mass m at the end of an unstretchable string of length L, swings upward, making an angle θ with the vertical. The work done by the tension in the string is
(a) Zero.
(b) mgL
(c) mgL cos θ
(d) -mgL sin θ