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A planet is revolving around the sun in ...

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

the total energy of the sun plus planet system

B

the angular momentum of the planet about the sun

C

the force of attraction between the two

D

the linear momentum of the planet

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The correct Answer is:
A, B
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