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This article explains why it is so : Escape velocity - Wikipedia, the free encyclopedia.
1. The radius of the moon is roughly 1080 miles. The acceleration of the gravity at the surface of the moon is about 0.165g, where g is the acceleration of the gravity at the surface of the Earth. Determine the velocity of escape for the moon.
Answer: 1.5 miles/sec
Are you aware that ?
This article explains why it is so : Escape velocity - Wikipedia, the free encyclopedia.