You can calculate escape velocities by using the conservation of energy. In other words, we need to realize that the kinetic energy needed to escape has to be equal to the gravitational potential energy.

Given that GMm Gravitational P.E. = ----- r mv^{2}Kinetic Energy = ----- 2 then ------ / 2GM v = / ----- \/ r

Where
**G** is the universal gravitational constant
(6.67 * 10^{-11}
m^{3} / kg * s^{2}), **M** is the
mass of the body and **r** is that body's radius.
The escape velocity
for different planets in the solar system
are approximately:

Mercury: 4.25 km/s

Venus: 10.36 km/s

Earth: 11.18 km/s

Mars: 5.02 km/s

Jupiter: 59.64 km/s

Saturn: 35.41 km/s

Uranus: 21.41 km/s

Neptune: 23.52 km/s

Pluto: 1.00 km/s