YouTuber Giaco Whatever built a custom pneumatic cannon, and launched a NERF dart from it which achieved a speed of roughly MACH 2.3, or 2.3 times the speed of sound. While NERF darts are designed to, at best, sting a little, even a foam-body projectile will do quite a bit of damage going that speed.
Anyone want to try an guess the foot-poundage coming out of the muzzle on this one?
Check out more of Giaco Whatever’s videos on their YouTube channel here.