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Physics (please help)

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A planet is in circular orbit about a remote star, far from any other object in the universe. Which of the following statements is true?
a. None of the other statements are true.
b. There is only one force acting on the planet.
c. There are two forces acting on the planet and their resultant is not zero.
d. There are two forces acting on the planet and their resultant is zero.

I'm not sure of this question... I say it's c... can someone please help me with this?

  • Physics (please help) -

    b. The only force acting on the planet is the gravity due to the star.

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