The mass of moon is (1)/(81) of earth 's...

The mass of moon is `(1)/(81)` of earth 's mass and its radius is `(1)/(4)` of that of earth .If the escape velocity from the earth 's surface is 11.2km/s , is value for the moon is :

0.14 km/s

0.5 km/s

2.5 km/s

5.0 km/s

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