A satellite s is moving in an elliptical...

A satellite s is moving in an elliptical orbit ,paround the earth. The mass of the satellite is very small compared to the mass of the earth, Then,

The acceleration of s is always directed towards the centre of earth.

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

The total mechanical energy of s varies periodically with time.

The magnitude of s remains constant

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