Gravitational PE of a 2 kg mass at altitude 2R above Earth's surface (g at surface = 10, R = 6400 km):
A-GMm/(3R)
B-GMm/(4R)
C-GMm/(2R)
D-mgR/3
Answer & Solution
Correct answer: A. -GMm/(3R)
At altitude h = 2R, distance from centre is r = 3R. U = -GMm/r = -GMm/(3R).
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