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... In the case of Kittinger I used
mass = 100 kg
drag coef = .7
area = .7 m^2
surface density = 1.3 kg/m^3
scale height = 7000 m
init speed = 0 m/s
init altitude = 30,000 m
g = 9.8 m/s^2
I found that the speed topped out at 1000 m/s (~1% error from the
quoted value in the film) ...
... For instance, if you "jump" from 100 km
(I'm not sure how you do that practically speaking!), drag is
completely inconsequential for the first two minutes and you reach
speeds around 3.6 km/s. ...