We have seen that one can compute the escape velocity from a body via
You've already applied this equation to the Earth. Why not practice on some of the other bodies in our solar system? (Disclaimer: yes, some of these objects lack a solid surface, so imagine the velocity it would take to shoot a cannonball from a big cannon floating high above the cloudtops in a gigantic ballon).
Body Mass Radius Escape velocity ------------------------------------------------------------------- Sun Mercury Venus Earth Moon Mars Jupiter Saturn Pluto Vesta Ida -------------------------------------------------------------------