pull the ball back (downwards) and release. Don't pull it back too much though..... Have Fun with this! You can use this with or without credit! NOTE: The colour of the elastic string indicates the stress put on the elastic string.
@-BlueFlames- made the basic code for the rubber band. I added the stress indicator, mouse interaction (showing elastisity) and I made the physics more life-like. And I obviously added the ball! NOTE: For best results, I suggest that you pull the rubberband down to -100 on the Y axis.