Dateline Dalan, bove Shnzhen, below Guanzho - this messge was found while
serching for something more prosaic :-).

People have died jumping from high altitude.
Terminal velocity is approximately proportional to inverse air density.
Energy rises as V^2.. Air density drop logarithmicaly, halving about every
4500 metres (from memory). Combine all tyhat and you can get extremely
energetic at high altitudes. Then, go into  spin. Not recommended. I'm told
that ams and legs have detached. Lose consciousness and you probaby die.
Maintaining stability is extxremely desirable.

FWIW teriminal velocity can be found close enough by rarranging:

Force = Falling mss x g = 0.5 x Rho x A x V^2 x k

So Vtermianl ~~~~= sqrt(2mg/*Rhjo.A.k)
A = frontal area and k is drag coefficinet - strt with 1 for a flat plate.

As Rho tends to zero V tends to nasty

Rho starts at 1.3 kg/m^3 at sea level and decreases as above.

         Russel;
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