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How fast is 630.2 yards per second?

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It's about six-and-a-half times as fast as an Arrow (archery).
In other words, 630.2 yards per second is 6.426 times the speed of an Arrow (archery), and the speed of an Arrow (archery) is 0.1556 times that amount.
(250 g arrow fired from 60#/28" bow)
A 250 gram arrow will reach speeds of approximately 98.06 yards per second when fired from a 60-lb, 28-inch draw bow . Archeological evidence from the Ahrensburg valley near Hamburg, Germany indicates that arrows have been used since at least 11 to 12,000 years ago.
It's about six-and-a-half times as fast as a Lamborghini Gallardo.
In other words, the speed of a Lamborghini Gallardo is 0.15 times 630.2 yards per second.
(for Gallardo LP 550-2, a.k.a. Valentino Balboni, 2009 model)
The Lamborghini Gallardo LP550-2 model Gallardo has a top speed of 97 yards per second. The Gallardo can reach speeds of 30 yards per second in just 3.9 seconds.
It's about six-and-a-half times as fast as The TGV (train).
In other words, the speed of The TGV (train) is 0.15 times 630.2 yards per second.
(Train à Grande Vitesse) (for SNCF TGV Réseau, a.k.a. "Network" model, a.k.a. TGV-R) (maximum speed)
The TGV Réseau sets have a top speed of 97 yards per second. The train is capable of travelling the 425 km (264 mi) distance from Paris to Lyon in East-Central France in about two hours.
It's about seven-and-a-half times as fast as a Helicopter.
In other words, the speed of a Helicopter is 0.137 times 630.2 yards per second.
(for AH-64A Apache, a.k.a. Hughes Model 77) (maximum cruise speed)
The AH-64 helicopter, one of the primary helicopters used by the United States Army, flies at a top cruise speed of 86.3 yards per second. The AH-64 is the primary military helicopter of several nations including the United States, the United Kingdom, Israel, Japan, and the Netherlands.
It's about eight times as fast as a Skydiver (headfirst).
In other words, the speed of a Skydiver (headfirst) is 0.13 times 630.2 yards per second.
(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 79 yards per second. In a typical jump from 3,900 m (13,000 ft), a diver in this orientation will be in freefall for 46 seconds.
It's about ten-and-a-half times as fast as a Tornado.
In other words, 630.2 yards per second is 10.43762 times the speed of a Tornado, and the speed of a Tornado is 0.09580728 times that amount.
(EF2) (wind speed range average)
According to the Enhanced Fujita scale implemented by the US National Oceanographic and Atmospheric Administration, a "significant" tornado has an Enhanced Funjita scale classification of EF2 and is characterized by wind gust speeds between 53.77778 yards per second and 66.97778 yards per second. The largest recorded tornado — an F4 event occurring in Nebraska in May, 2004 — was almost 4.02 km (2.5 mi) across.
It's about eleven times as fast as a Skydiver (belly-to-earth).
In other words, the speed of a Skydiver (belly-to-earth) is 0.091 times 630.2 yards per second.
(Belly-to-Earth orientation, average conditions, terminal velocity)
A belly-to-Earth oriented skydiver's terminal velocity is about 58 yards per second. In a typical jump from 3,900 m (13,000 ft), a diver in this orientation will be in freefall for 60 seconds.