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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 compared to the mass of the earth. Then,

A

the acceleration of S is always directed towards the centre of the earth

B

the angular momentum of S about 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

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