Idle

elasticity (k)

gravity (px/s²)

drag (k)

user acceleration (px/s²)

current velocity (px/s) = 0

0: feel free to WASD

1: gravity will forever add more energy to the system, and if the elasticity >= 1, the ball will appear to gain energy out of nowhere

2: technically made with love in SF (I was flying over SF when I made this)