Let v be the velocity of projection of the body from Earth.
Since the total mechanical energy is conserved by the gravitational force, the energy at a distance d from the center of Earth is given by:
It is called the escape velocity of Earth, as a body projected with this velocity away into the space, just manages to travel to infinite distance. Substituting the values numerically and calculating, ,we find
If a body is projected with a velocity 11.5 km/sec., then the body escapes from the gravitational field of Earth and it will have some kinetic energy still. After that it will move at uniform velocity:
Perhaps the body will get into gravitational field of another planet in space.