Yes. However it depends on what you hit at the bottom. If your head hits a rock, definitely. True story: A man parachuted from 5000 feet and his chutes didn't open. He landed feet first (must have been a really soft surface) and walked away. The only difference was that he was an inch and a half shorter.  So you just never know, but a fifty foot fall could kill you depending upon what you land on and how you land.