The acceleration due to gravity on Moon (mass 1/81 Earth, radius 1/4 Earth) is approximately:
Ag/6
Bg/9
C16g/81
Dg/16
Answer & Solution
Correct answer: C. 16g/81
g_moon/g_earth = (M_moon/M_earth)/(R_moon/R_earth)² = (1/81)/(1/16) = 16/81 ≈ 0.197. So g_moon ≈ 1/5 of Earth's g, about 1.9 m/s².
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