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Questions  

The moon's radius is 1/4 that of the earth and its mass is 1/80 times that of the earth. If g represents the acceleration due to gravity on the surface of the earth, that on the surface of the moon is

a
g/4
b
g/5
c
g/6
d
g/8

detailed solution

Correct option is B

Using  ge=GMR2  gm=GMmRm2=GM80R42=GM80R216=GMR2×1680=g×15

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