Escape velocity

minimum speed that a body must reach to overcome a gravitational pull

For other senses of this term, see escape velocity (disambiguation).In physics, escape velocity is the speed where the kinetic energy of an object is equal in magnitude to its potential energy in a gravitational field.It is commonly described as the speed needed to "break free" from a gravitational field; however, this is not true for objects under their own power.
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Escape velocity is the minimum speed an object without propulsion needs to have to move away indefinitely from the source of the gravity field.Escape velocity may also refer to:Escape Velocity (band)Escape Velocity (Doctor Who), a Doctor Who novelEscape Velocity (novel), a novel written by Christopher Stasheff in his Gramarye seriesIn computer games:Escape Velocity (computer game)Escape Velocity Override, its sequelEscape Velocity Nova, the most recent title in the Escape Velocity franchise, along with an expandable card-driven board game based on it
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Noun
1. the minimum velocity needed to escape a gravitational field
(hypernym) speed, velocity

The velocity an object must attain if it is to escape a celestial object's gravitational influence. For instance, the escape velocity for an object to leave the Earth is approximately 12 km/s or 42,000 km/hr. Though the molecules in the upper atmosphere are in continuous high speed motion very few are fast enough; however the less massive Moon has a lower escape velocity of 2.3 km/s and so if it had an atmosphere it has gone.

escape velocity
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