• # question_answer 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? A)  The potential energies of earth satellites in the two cases are equal.B)  ${{S}_{1}}$ and ${{S}_{2}}$ are moving with the same speed.  C)  The kinetic energy of the two satellites are equal.D)  The time period of ${{S}_{1}}$ is four times that of ${{S}_{2}}$

Since orbital velocity of satellite is${{V}_{0}}=\sqrt{\frac{GM}{r},}$it does not depend upon the mass of the satellite. Therefore, both satellites will move with same speed.