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A planet is revolving round the sun in a...

A planet is revolving round the sun in an elliptical orbit. Of the following the property which is a constant during the motion of the planet is :

A

The force of attraction between the planet and sun.

B

The total energy of the `"planet plus sun"` system.

C

The linear momentum of the planet.

D

The kinetic energy of the planet about the sun.

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The correct Answer is:
B
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