during motion of a planet from perihelion to aphelion the work done by gravitation force of sun on it is
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during motion of a planet from perihelion to aphelion the work done by gravitation force of sun on it is NEGATIVE
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negative
When potential energy decreases, the work done by the gravity is positive. From perihelion to aphelion, the potential energy of the planet has increased, therefore the work done by the gravity is negative.
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