No you won't kill any body this way. T well actually flip flat do to the sure wind force *it would hurt like the first person stated* you would have to dump buckets of change to kill some one,even then it's the sure weight of the change that would kill the person not cutting them in half I you were thinking lol. Yes you were thinking that :P
It's all about critical velocity, which is the speed achieved, due to the resistance of the air. I once read a book that explained about animals dropped from airplanes. An elephant would explode on hitting the ground, a dog would break a leg or worse, a cat would be dazed, a mouse would just scamper away, and a beetle wouldn't even notice. Interesting stuff, critical velocity!