Longest list of weapons that can kill a human
Gravity will make an object accelerate forever... but on earth the air fights back. The faster you go, the more air you run into slowing you down.
The point at which the acceleration from gravity is canceled by the wind resistance is known as terminal velocity. The terminal velocity of a penny is far slower than a bullet. In fact it wouldn't be going much faster than if someone were to throw a penny at you. Sure it might hurt, but it would only be an annoyance.
A box of sugar glaced donuts