Terminal Velocity
I had a great object lesson on terminal velocity the other day. A model rocket I was flying with a flight computer (accelerometer+altimeter) lost its nosecone on descent. The plastic nosecone fell from hundreds of feet up, with the flight computer (size of a keyfob) attached. I found the nosecone assembly lying unharmed on the grass, and the computer dutifully reported its descent speed was 29 mph. (Under the parachute the usual descent speed is between 10 and 15 mph.)
If it had hit you it would not have hurt much...just like being hit by a whiffle ball at most.