7. A satellite of mass m circles a planet of mass M and radius R in an orbit at a height 2R above the surface. What minimum energy is required to change the orbit to one for which the height of the satellite is 3R above the surface?
(A)GmM/(24R)
(B)GmM/(15R)
(C)GmM/(12R)
(D)2GmM/(21R)
(E)3GmM/(5R)

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