If a penny hits you at 126 mph will you die?

Answer 1

I cant imagine there is much research to give you a definite answer to your specific question but I would say it is very unlikely, but could be remotely possible.

We think of anything over 100mph as being fast because we tend to relate that sort of speed to driving a car and generally anything over 60 mph starts to be thought of a 'fast'.

In ballistic terms 126mph is pretty slow and the mass of a penny would not cause great trauma unless it hit you in the eye for example. Anywhere else on the body would probably sting a lot and would probably leave a bruise and possibly break the skin.