A satellite S is moving in an elliptical...

A satellite S is moving in an elliptical orbit around the earth. The mass of the satellite is very small as comapred to the mass of the earth. Then,

The acceleration of S is always deirected towards the centre of the earth

The angular momentum of S about the centre of the earth changes in direction , but its magnitude remains constant .

The total mechnical energy of S varies periodically with time

The linear momentum of S remains constant in magnitude

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