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Potential Energy of an Object at a Height

Consider a pl...

Question

Consider a planet moving in an elliptical orbit round the sun. The work done on the planet by the gravitational force of the sun

A

is zero in any small part of the orbit.

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B

is zero in some parts of the orbit.

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C

is zero in one complete revolution.

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D

is zero in no part of the motion.

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Solution

The correct option is B is zero in some parts of the orbit.
The work done is zero at points A and B, since the force acts along the AB axis and the motion is perpendicular to it( $W = | F | | S | cos θ$ )

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