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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.

A

the linear momentum of S remains constant in magnitude

B

the total mechanical energy of the S varies periodically with time

C

the angular momentum of S about the centre of the earth changes its direction but its magnitude remains constant

D

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

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The correct Answer is:
D
(a), (b) and (c ) are wrong because v is changing. E remains constant because the force is conservative and angular momentum remains constant. Force is directed towards the centre.
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