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Question

A planet is revolving around the sun in an elliptical orbit. Which of the following remains constant ?

A
Linear momentum
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B
Angular momentum
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C
Kinetic energy
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D
Potential energy
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Solution

The correct option is D Angular momentum
Answer is B.
According to Kepler's second law, the angular momentum of the planet is constant. The angular momentum of the planet does not vary, i.e. the aerial velocity of the planet remains constant.

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