In gravitation, escape velocity is the speed where the kinetic energy -KE plus the gravitational potential energy of an object is zero. Escape velocity is the speed needed to "break free" from a gravitational field with no further propulsion.
For a spherically body or symmetric body, escape velocity is finding out by the formula
Where G is known as the universal gravitational constant (G=6.67×10-11 m3 kg-1 s-2), M termed as mass of the planet, star or other body, and r the distance calculated from the center of gravity.
In given equation atmospheric friction or air drag is not taken into account. A rocket moving out of gravity well does not in fact need to attain escape velocity to do so, but could achieve the same result at walking speed with a suitable mode of propulsion & sufficient fuel. Escape velocity only applicable to ballistic trajectories.
The term escape velocity is in fact a misnomer, and it is often more accurately termed to as escape speed since the necessary speed is a scalar quantity that is independent of direction.
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