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Escape velocity

Astronomy, astrophysics index

Escape velocity is calculated here as (2G m/r)^0.5 without taking friction (i.e. atmospheric resistance) into account. It is derived from the Newtonian equations for gravitational potential energy and kinetic energy.
 Mass of body kg --- METRIC --- ng µg mg grams tonnes M tonnes -- IMPERIAL -- grains ounces pounds stones cwt tons --- OTHER --- u (Da) Troy ounces carats pennyweight Moons Earths Suns Distance from center m --- METRIC --- pm nm microns (µm) mm cm km -- IMPERIAL -- mil 1/16 inch inches feet yards miles - SCIENTIFIC - Planck Bohrs Angstrom light-seconds light-years au parsecs --- OTHER --- points cubits fathoms rods chains football fields furlongs Roman miles nautical miles leagues Escape velocity m/s --- METRIC --- cm/s km/s -- IMPERIAL -- inches/second feet/second feet/minute - RECIPROCAL - min/mile min/km min/5 km min/10 km --- OTHER --- km/h mph miles/second knots furl's/f'night Mach c (light speed) Add

The "escape velocity" of an unpowered object with respect to a massive body is the speed that the object needs to be traveling at in order to escape the gravitational field of the body from its current distance from the body center of mass. It is independant of the object mass or direction of movement (and therefore is not truly a "velocity" at all).
Note that a powered object may escape the gravity of a body at any speed desired.