What is the relationship betweek surface gravity and excape velocity?
Equate the kinetic energy to the surface gravitational potential to get
2 G M m
1/2 m V = ---------
the escape velocity is then
2 2 G M
V = -------
where in gram-cm units G = 6.6 x 10^-8,
R is the radius of the planet in centimeters,
M is the mass of the planet in grams, and
V is the escape velocity in cm/sec.
from Ask an Astronomer http://image.gsfc.nasa.gov/poetry/ask/a11012.html