GravitationHard

Question

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

Options

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

Solution

For escape velocity, ve =
ve =
ve = × 11.2 = 2.5 km / sec

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