It can achieve escape at any speed, given sufficient propellant to provide new acceleration to the rocket to counter gravity's deceleration and thus maintain its speed.
The escape speed thus depends on how far the object has already traveled, and its calculation at a given distance takes into account that without new acceleration it will slow down as it travels-due to the massive body's gravity-but it will never quite slow to a stop.Ī rocket, continuously accelerated by its exhaust, can escape without ever reaching escape speed, since it continues to add kinetic energy from its engines. Although the term "escape velocity" is common, it is more accurately described as a speed than a velocity because it is independent of direction the escape speed increases with the mass of the primary body and decreases with the distance from the primary body. It is typically stated as an ideal speed, ignoring atmospheric friction. In celestial mechanics, escape velocity or escape speed is the minimum speed needed for a free, non- propelled object to escape from the gravitational influence of a primary body, thus reaching an infinite distance from it.
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