Question

what is escape velocity?

Answer 1

Escape velocity is defined to be the minimum velocity an object must have in order to escape the gravitational field of the earth, that is, escape the earth without ever falling back. 

The object must have greater energy than its gravitational binding energy to escape the earth's gravitational field. So: 

1/2 mv2 = GMm/R 

Answer 2

It is the minimum speed for an object to escape from the gravitational influence of a massive body

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