A satellite of mass m is in circular orbit of radius 3 ,R E about earth (mass of earth M E , radius of earth R E ). How much additional energy is required to transfer the satellite to a orbit of radius 9 ,R E ?

1. A. GM Em 3R E
2. B. GM Em 18R E
3. C. 3GM Em 2R E
4. D. GM Em 9R E

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