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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

1. 0.14 km / s
2. 0.5 km / s
3. 2.5 km / s
4. 5 km / s

Correct answer: 2.5 km / s

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