I got to thinking last night that theoretically, with enough hair, the air resistance would slow you down so that your terminal velocity would be low enough to land unharmed. How long would it need to be? How would one go about calculating this?
I assume you need some kind of drag coefficient and a density for hair to start with. Not sure where to find that information.
He had a valid point though; hair would not cause rapid deceleration. The bigger question is whether it affects your terminal velocity enough that you would survive the fall.
But even that has too many assumptions. People have survived falls from airplanes flying at 30,000 feet. Was it because of their hair? The displacement of their body and clothing? The surface they landed on?
Probably all of the above plus other uncalculated factors. But I doubt that hair drag played a big part; after all, there’s a reason we deploy 70lbs of horizontal airtight fabric instead of 70lbs of thread when skydiving.