a demonstration of a simple way to simulate gravity. adjust gravity strength (negative makes it fall upwards!), launch speed, and launch direction, then watch it fly. --IMPORTANT!-- If you use this in your own projects, make sure the "fall" variable (or your equivalent) is set to "this sprite only", that's how multiple balls can fly without affecting each other.
p. s. changing gravity from positive to negative while balls are in flight provides amusing results.
