I’m making a 2D platformer (How do you make a Ball or Sprite 'jump'?)

[ABG]

You can't loop to wait.

Here is a relevant project from the defunct Scott Ferguson graphics library:

Gravity Exercise

GravityExercise.aia (4.4 KB)

(My attempts at flinging with a trackball were mostly futile, but I got a bounce or two out of it.)