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A satellite S is moving in an elliptical orbit around the earth. The mass of the satellite is very small compared to the mass of earth

(a)      The acceleration of S is always directed towards the centre of the earth

(b)  The angular momentum of S about the centre of the earth changes in direction but its magnitude remains constant

(c)   The total mechanical energy of S varies periodically with time

(d)  The linear momentum of S remains constant in magnitude

Answer: a

(6)

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