Gravitational potential energy of a mass m at the surface of Earth (taking U at infinity as zero):
AGMm/R
BZero
C-GMm/R
Dmgh
Answer & Solution
Correct answer: C. -GMm/R
U = -GMm/r. At Earth's surface (r = R), U = -GMm/R. Negative because work must be done against gravity to bring it to infinity.
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