Correction for the speed of a Skydiver (headfirst)
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How fast is 68.660 miles per hour?
It's about two-fifths as fast as a Skydiver (headfirst)
The speed of a Skydiver (headfirst) is about 160 miles per hour.
(Head-to-Earth orientation or standing, average conditions, terminal velocity)
A head-to-Earth or standing-oriented skydiver's terminal velocity assuming average conditions is about 160 miles per hour. In a typical jump from 3,900 m (13,000 ft), a diver in this orientation will be in freefall for 46 seconds.