A planet X around a star S

The diagram shows an approximate orbit of a planet X around a star S.

KeplerProblem

Which of the following statements is false?

(a) The planet moves in an ellipse with the star at one focus.
(b) The planet moves at the same speed at points A and C.
(c) The planet moves fastest at point D.
(d) The potential energy of the planet changes during the orbit.

 

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