The Escape Speed from the Surface of the Earth Is

Multiple Choice

The escape speed from the surface of the Earth is 11.2 km/s.Estimate the escape speed for a spacecraft from the surface of the Moon.The Moon has a mass 1/81 that of Earth and a radius 0.25 that of Earth.

A) 2.5 km/s
B) 4.0 km/s
C) 5.6 km/s
D) 8.7 km/s