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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.
You are essentially trapped on Earth, unless you can find a rocket that can travel at escape velocity away from the Earth. The escape velocity can be calculated in Newtonian gravity by using energy conservation of an object of mass m in the gravitational field of a planet of mass M in D space dimensions: The escape velocity for the surface of the Earth is about 11 km/sec. Notice that's only 37 millionths of the speed of light.