The q key activates the jetpack.
Second iteration of my attempt to create a jetpack character who is pulled down as if by gravity but has a thrust to push him upwards. Problem: the thrust continues to build. Need a way to set it to zero when key released. Solved with an if statement. Didn't work at first because kept resetting to zero so thrust never got above 0.1. Stopped this by putting the not statement in so that if you hold the q key down then the thrust is not reset to zero.
