define escape velocity. derive an expression of the escape velocity of a satellite projected from the surface of the earth? the moon has no atmosphere. why?
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Explanation:In physics (specifically, celestial mechanics), escape velocity is the minimum speed needed for a free, non-propelled object to escape from the gravitational influence of a massive body. It is slower the farther away from the body an object is, and slower for less massive bodies.
The escape velocity from Earth is about 11.186 km/s
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