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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

Answer: b

(4)

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