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From the surface of the Earth, escape velocity (ignoring air friction) is about 7 miles per second, or 25,000 miles per hour. Given that initial speed, an object needs no additional force applied to completely escape Earth's gravity. Answered by: Paul Walorski, B.A. Physics, Part-time Physics Instructor.
If we are talking about the planet of earth, the escape velocity is the speed primary needed to start a shell at the top, in this case must be the top speed of 11 km / s to end up outside the Earth's atmosphere, and therefore we can say that it is the speed of liberalization of gravity.