what do you mean by escape velocity
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The initial velocity needed to achieve that condition is called escape velocity. 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.
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the minimum velocity needed to go out from the planets atmosphere overcoming it's gravitational force. Earth has 11.2km/sec escape velocity.
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