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Question

A satellite S is moving in an elliptical orbit around the earth.The mass of the satellite is very small as compared to the mass of the earth.Then (1) The acceleration of S is always directed towards the centre of the earth (2) The angular momentum of S about the centre of the earth changes in direction,but its magnitude remains constant (3) The total mechanical energy of S varies periodically with time (4) The linear momentum of S remains constant in magnitude

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