Question

A pendulum is swinging. Over a small displacement of the bob, work done by tension force on the bob is Wb, and that done by tension force on the ceiling is Wc. Then
(a) Wb > or < 0, Wc=0
b. Wc > or < 0, Wb=0
c. Wb=Wc=0
d. Wb > or < 0, Wc > or < 0​

Answer 1

according to the questions answer is c 8s the correct