For a planet moving around the sun in an elliptical orbit, which of the following quantities remain constant ?

Q: For a planet moving around the sun in an elliptical orbit, which of the following quantities remain constant?

(a) The linear momentum of the planet

(b) The force of attraction between the two

(c) The total energy of the sun and planet system

(d) The angular momentum of the planet about the sun

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Ans: (c) , (d)