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Question

Knowing that the mass of the moon is 1/81 times that of earth and its radius is 1/4 the radius of earth. If the escape velocity at the surface of the earth is 11.2km/sec, then the value of escape velocity at the surface of the moon is

A
2.5km/sec
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B
0.14km/sec
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C
5km/sec
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D
8km/sec
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