Question

A planet is revolving around the sun in an elliptical orbit. Which out of the following remains constant.
(a) Linear speed (b) angular momentum
( c) kinetic energy (d) potential energy (e) total energy throughout its orbit.
A. linear speed
B. angular momentum about the sun
C. kinetic energy
D. potential energy

Answer 1

Correct Answer - B
In elliptical orbit sun is at one of the foci hence the distance between the planet and sun changes as planet revolves hence linear speed, kinetic energy and potential energy of planet of do not remain constant