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Gravitational force and laws

A planet revolves around the sun is an elliptical orbit. The maximum and minimum distances of the planet from the sun are a and b respectively. The time period of revolution of the planet is proportional to


According to Kepler's law, the square of the time period is proportional to the cube of the semi-major axis of the ellipse, i.e. T2a+b23. So the correct choice is (c).

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