<P> The escape velocity from Earth is about 11.186 km / s ( 6.951 mi / s ; 40,270 km / h ; 25,020 mph ) at the surface . More generally , escape velocity is the speed at which the sum of an object 's kinetic energy and its gravitational potential energy is equal to zero ; an object which has achieved escape velocity is neither on the surface , nor in a closed orbit ( of any radius ) . With escape velocity in a direction pointing away from the ground of a massive body , the object will move away from the body , slowing forever and approaching , but never reaching , zero speed . Once escape velocity is achieved , no further impulse need be applied for it to continue in its escape . In other words , if given escape velocity , the object will move away from the other body , continually slowing , and will asymptotically approach zero speed as the object 's distance approaches infinity , never to come back . Speeds higher than escape velocity have a positive speed at infinity . Note that the minimum escape velocity assumes that there is no friction ( e.g. , atmospheric drag ) , which would increase the required instantaneous velocity to escape the gravitational influence , and that there will be no future sources of additional velocity ( e.g. , thrust ) , which would reduce the required instantaneous velocity . </P>
<P> The escape velocity from Earth is about 11.186 km / s ( 6.951 mi / s ; 40,270 km / h ; 25,020 mph ) at the surface . More generally , escape velocity is the speed at which the sum of an object 's kinetic energy and its gravitational potential energy is equal to zero ; an object which has achieved escape velocity is neither on the surface , nor in a closed orbit ( of any radius ) . With escape velocity in a direction pointing away from the ground of a massive body , the object will move away from the body , slowing forever and approaching , but never reaching , zero speed . Once escape velocity is achieved , no further impulse need be applied for it to continue in its escape . In other words , if given escape velocity , the object will move away from the other body , continually slowing , and will asymptotically approach zero speed as the object 's distance approaches infinity , never to come back . Speeds higher than escape velocity have a positive speed at infinity . Note that the minimum escape velocity assumes that there is no friction ( e.g. , atmospheric drag ) , which would increase the required instantaneous velocity to escape the gravitational influence , and that there will be no future sources of additional velocity ( e.g. , thrust ) , which would reduce the required instantaneous velocity . </P>
energy required for satellite to escape from earth
energy required for satellite to escape from earth
about 11.186 km / s ( 6.951 mi / s ; 40,270 km / h ; 25,020 mph ) at the surface
about 11.186 km / s ( 6.951 mi / s ; 40,270 km / h ; 25,020 mph ) at the surface