What is escape velocity ?
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A spacecraft leaving the surface of Earth, for example, needs to be going about 11 kilometers (7 miles) per second, or over 40,000 kilometers per hour (25,000 miles per hour), to enter orbit. An Endless Cycle. Achieving escape velocity is one of the biggest challenges facing space travel.
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escape velocity :
it is the minimum speed required by a free body to free itself from the gravitational influence of a large body
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