Escape velocity is the speed at which the kinetic energy plus the gravitational potential energy of an object is zero. It is the speed needed to “break free” from a gravitational field without further propulsion. For a spherically symmetric massive body, the escape velocity at a given distance can be calculated by the mass of the massive body, and the distance from the center of gravity. ( Atmospheric friction (air drag) is not taken into account).
“Escape velocity” is the initial speed required to go from an initial point in a gravitational potential field to infinity with a residual velocity of zero, with all speeds and velocities measured with respect to the field.
|Ue||Escape Velocity (m/s)|
|G||Newtonian constant of gravitation|
|M||Mass of the massive body (kg)|
|r||Distance from center of gravity (m)|