Question

__________ velocity of the planet is constant when it revolves in an elliptical orbit around the Sun.

Answer 1

According to Kepler's Second law:

1. The area swept by the planet around the sun is equal in equal time.
2. The velocity of the planet sweeping out an equal area in equal time is called aerial velocity.
3. The angular moment of the planet remains constant.

Hence, Aerial velocity of the planet is constant when it revolves in an elliptical orbit around the Sun.