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Given mass of the moon is 1/81 of the mass of the earth and corresponding radius is 1/4 of the earth. If escape velocity on the earth surface is 11.2 km/s, the value of same on the surface of the moon is

(a)      0.14 km/s                         (b)  0.5 km/s

(c)   2.5 km/s                            (d)  5 km/s

Answer:  c

(4)

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