Question

A pendulum is oscillating on either side of its rest position. The correct statement is:

(a) It has only the kinetic energy.

(b) it has the maximum kinetic energy at its extreme position.

(c) it has the maximum potential energy at its rest position.

(d) The sum of its kinetic and potential energies remains constant throughout the motion.

Answer 1

The sum of its kinetic and potential energy remains constant throughout the motion.

Hint: In accordance with law of conservation of mechanical energy, whenever there is an interchange between the potential energy and kinetic energy, the total mechanical energy remains constant.