download python 3.2 here : http://www.python.org/ftp/python/3.2.2/python-3.2.2.msi
download vPython 3.2 here : http://www.python.org/ftp/python/3.2.2/python-3.2.2.msi
open file using VIDLE for Python then press f5 to run the code
some variable definition just in case needed :
v0 = initial velocity ball.m = ball mass ball.v = ball velocity ball.pos = ball position