$A$ 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 acceleration of $S$ is always directed towards 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 constant in magnitude.

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