A spaceship of mass m1 circles a planet (mass = m2) in an orbit of radius r. How much energy is required to transfer the spaceship to a circular orbit of radius 3R?
A. Gm1m2/(2r)
B. ?Gm1m2/(3r)
C. ?Gm1m2/(4r)
D. ?Gm1m2/(6r)
E. 3Gm1m2/(4r)
Answer: B
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