Escape velocity is defined as the minimum speed needed for a free object to escape from the gravitational influence of a massive body. In other words, escape velocity is the minimum speed of an object without propulsion to be able to escape the gravitational potential energy at a given point. The escape velocity of earth is 11.219 kilometre per second, which means that objects travelling faster than 11.3 kilometres in one second can escape the earth's gravitational pull. One need not increase the speed later on because there will not arise the need for any sort of future acceleration or deceleration. The existence of escape velocity is a consequence of conservation of energy. A common misconception that arises is in the definition of escape velocity. Even though it is termed so, escape velocity is in fact a ‘speed’ and does not specify a direction. It means that whichever direction the object travels after attaining escape velocity it will still succeed in escaping the gravitational field of the planet.
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