So i've been becoming pretty obsessed with base jumpers. However its a pretty dangerous sport and as it turns out (surprise) a lot of them die. I was just wondering how much force the human body can survive. Say a 90kg base jumper jumped off of a 900m mountain and their parachute failed to open or had a malfunction, obviously they would not survive but how much force do they actually experience when they hit the ground? And what is survivable by humans?