[Tutor] What's the error (program)

[Bob Gailer]

I downloaded Visual; running with Python 2.2.2. When I run the program I 
get the balls and the "hands" but nothing moves. I set up a very small 
program with one ball and a loop to change velocity and position. Position 
changes; velocity does not. Any ideas?

Bob Gailer
170 Forsythe Rd
Nederland CO 80466
303-442-2625