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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.
To leave Earth's orbit, the spacecraft has to fly faster than Earth's escape velocity (the velocity required to escape the gravitational influence of Earth on the spacecraft). Prior to the third stage firing, the spacecraft is only going about 19,500 mph and it is stuck orbiting Earth.o leave Earth's orbit, the spacecraft has to fly faster than Earth's escape velocity (the velocity required to escape the gravitational influence of Earth on the spacecraft). Prior to the third stage firing, the spacecraft is only going about 19,500 mph and it is stuck orbiting Earth.