WBCS.LIVE practice question

Kepler's Second Law of Planetary Motion (the Law of Areas) is a direct consequence of the conservation of which quantity?

Solve this multiple-choice question and check the correct answer with its explanation below.

Answer options

  1. Kinetic energy
  2. Linear momentum
  3. Total mechanical energy
  4. Angular momentum

Correct answer and explanation

Correct answer: Angular momentum

Explanation: āœ… Correct Answer: D) Angular momentum šŸ“š Explanation: Kepler's Second Law states that a line segment joining a planet and the Sun sweeps out equal areas during equal intervals of time. Because the gravitational force acting on the planet is a central force, there is no external torque. Therefore, the angular momentum of the planet remains strictly constant.