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678 yards per minute is about one-tenth as fast as a Skydiver (headfirst)
In other words, it's 0.140 times the speed of a Skydiver (headfirst), and the speed of a Skydiver (headfirst) is 7.10 times that amount.
(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 4,700 yards per minute. In a typical jump from 3,900 m (13,000 ft), a diver in this orientation will be in freefall for 46 seconds.
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