Definition of escape velocity
In physics, escape velocity, ( i.e., the lowest velocity ), is the minimum speed required for an independent, non-propelled object to survive the gravitational effects of a massive body. The maximum velocity required to escape the gravitational field of the Earth or any planet is also known as the migration velocity or the lowest velocity that a body must have in order to escape the gravitational attraction of a particular planet or other object.
The escape velocity is only required to send a ballistic object on a trajectory that allows the object to escape the gravity of the mass. Apart from this, any rocket or spacecraft also needs mode of propulsion and sufficient propellant i.e., fuel, to go out of gravity.
Escape velocity formula –
Any spherical star, or planet, at a distance for that body, the escape velocity is calculated by this formula –