> This example assumes a physically impossible infinitely-sharp corner The sharp corner isn’t the problem, and there are plenty of setups with sharp corners th

> This example assumes a physically impossible infinitely-sharp corner The sharp corner isn’t the problem, and there are plenty of setups with sharp corners that work just fine. > Zeno-paradoxical infinitely small jump from the initial position to some other position after time T Every acceleration does that. The issue here is the way that the ball gets to the apex in finite time instead of approaching it asymptotically as t goes to infinity.