Two satellites of earth, S 1 and S 2 are moving in the same orbit. The mass of S 1 is four times the mass of S 2 . Which one of the following statements is true?

1. A. The potential energies of earth satellites in the two cases are equal.
2. B. S 1 and S 2 are moving with the same speed.
3. C. The kinetic energies of the two satellites are equal.
4. D. The time period of S 1 is four times that of S 2 .

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