![]() One somewhat counterintuitive feature of escape velocity is that it is independent of direction, so that "velocity" is a misnomer it is a scalar quantity and would more accurately be called "escape speed". It is commonly described as the speed needed to "break free" from a gravitational field. In any case, the object is assumed to be a point with a mass that is negligible compared with that of the source of the field, usually an excellent approximation. This definition may need modification for the practical problem of two or more sources in some cases. The object is assumed to be influenced by no forces except the gravitational field in particular there is no propulsion, as by a rocket, there is no friction, as between the object and the Earth's atmosphere (these conditions correspond to freefall) and there is no gravitational radiation. ![]() In physics, for a given gravitational field and a given position, the escape velocity is the minimum speed an object without propulsion, at that position, needs to have to move away indefinitely from the source of the field, as opposed to falling back or staying in an orbit within a bounded distance from the source. ![]()
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