Another fork of my velocity test projects involving a cat. This one adds angles to the mix, allowing for some interesting bounces, and lets you use a pen. Up Arrow and Down Arrow adjust angle. Press and hold Right Arrow to use the pen. Press the green flag to clear pen marks.
As always you are free to use every part of this for your own devices: All code is commented with explanations. If you can figure out how to solve a minor error in the code that I had to work around using weird application of the velocity variable, I would be thankful.