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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, which one of the following statements is correct?

A

the acceleration of S is always directedtowards the centre of the earth.

B

the angular momentum of S about the centre of 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 constants in magnitude

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