Question

Comets move around the sun in elliptical orbits. Is work done by the gravitational force on the comet is zero or non- zero? Explain.

Answer 1

Answer:

Gravitational force is a conservative force. ... In a complete revolution of the sun by a comet, the displacement becomes zero, so the work done by the gravitational force over every complete orbit of the comet is zero

Answer 2

Gravitational force is a conservative force. Hence the work done depends on the initial and final positions.

In a complete revolution of the sun by a comet, the displacement becomes zero, so the work done by the gravitational force over every complete orbit of the comet is zero.

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