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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.
Escape Velocity is the speed needed to break free from a gravitational field of the object (Earth, Sun etc.). The speed needed to leave gravitational field of the Earth is about 11.19 km/s = 25031 mph. Speed Of Light Travel. The speed of light depends on the properties of the medium through which it travels.