Question

A pendulum is oscillating about its mean position in vacuum. It has:

• A. Only kinetic energy
• B. Maximum kinetic energy at extreme position
• C. Maximum potential energy at its mean position
• D. Sum of kinetic energy and potential energy remains constant throughout the motion

Answer 1

Answer: (D)

Sum of kinetic energy and potential energy remains constant throughout the motion

Maximum potential energy is at extreme position.

Maximum kinetic energy is at mean position.

Energy is conserved thus, sum of K.E. and P.E. is always constant throughout the motion in vacuum as their is no other force acting.