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The areal velocity of a planet is constant. This is stated by ___________

(a) Newton’s third law of motion

(b) Kepler’s second law of planetary motion

(c) Fourier’s law

(d) Kirchhoff’s planetary law

I have been asked this question in an internship interview.

My doubt stems from Forces of Nature topic in chapter Gravitation of Engineering Physics I

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Correct option is (b) Kepler’s second law of planetary motion

To elaborate: A planet revolves around the sun under the influence of a gravitational force which acts towards the sun. This means that the areal velocity of a planet is constant. The is Kepler’s second law of planetary motion which states that the line joining the planet to the sun sweeps out equal areas in equal intervals of time.

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