A satellite \( S \) is moving in an elliptical orbit around the ear...

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A satellite \( S \) is moving in an elliptical orbit around the earth. The mass of 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 its 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
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