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Mar18-05, 11:36 PM
P: 2,219
The force you hit the ground with isnt what kills you, its the impulse, or time derivative of force. At 10m/s (25mph) you would survive a crash whereas at 100m/s (250mph) you are going to impart alot more energy in the same time interval (much higher impulse) which is what kills you.

Keeping air resistance in mind, terminal velocity is about 100-150 mph, so once you hit that speed your not going to accelerate any longer and will be in freefall. Given a height of jump "h1" where terminal velocity is reached during the fall, any height greater than h1 will result in the same speed of downfall and therefore the same impact velocity.