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How fast is 48.90 yards per second?

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It's about one-and-one-tenth times as fast as a Fastball (baseball).
In other words, the speed of a Fastball (baseball) is 0.910 times 48.90 yards per second.
(a.k.a. rising fastball, a.k.a. cross-seam fastball, a.k.a. heater, a.k.a. hummer, a.k.a. smoker; for four-seam grip) (major league average)
The average speed of major league fastball pitch is 46 yards per second. When up against the quickest professional fastball pitchers, a batter may have less than 0.4 seconds to react to a pitched ball.
It's about four-fifths as fast as a Skydiver (belly-to-earth).
In other words, 48.90 yards per second is 0.840 times the speed of a Skydiver (belly-to-earth), and the speed of a Skydiver (belly-to-earth) is 1.20 times that amount.
(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.
It's about four-fifths as fast as a Tornado.
In other words, 48.90 yards per second is 0.80990060 times the speed of a Tornado, and the speed of a Tornado is 1.2347190 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 53.777780 yards per second and 66.977780 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 one-and-three-tenths times as fast as a Curveball (baseball).
In other words, the speed of a Curveball (baseball) is 0.770 times 48.90 yards per second.
(a.k.a. hook, a.k.a. hammer, a.k.a. yakker) (major league average)
The average speed of major league curveball pitch is 36 yards per second. In the 1940's, debate over whether there really was a curve in the curveball pitch was settled with the conclusion that the ball does curve; however, an optical illusion caused by the spin of the ball and the batter's perception of motion exaggerates the extent of the curve.
It's about one-and-one-third times as fast as a Hurricane.
In other words, the speed of a Hurricane is 0.7410 times 48.90 yards per second.
(formally: Topical cyclone; a.k.a. typhoon)
A hurricane is defined by the US National Hurricane Center as a Northern Hemisphere tropical storm having one-minute average wind-speeds of at least 36.10 yards per second. Typhoons Tip (October, 1979) and Keith (October, 1997) and Hurricanes Camille (August, 1969) and Allen (August, 1980) jointly hold the record for highest tropical storm wind speeds at 94.20 yards per second.
It's about one-and-a-half times as fast as a Cheetah.
In other words, 48.90 yards per second is 1.4570 times the speed of a Cheetah, and the speed of a Cheetah is 0.68630 times that amount.
(Acinonyx jubatus)
The cheetah can reach speeds of up to 33.570 yards per second in short bursts. From a crouching position, the cheetah can attain these speeds in just 2.25 seconds.
It's about one-and-a-half times as fast as a Knuckleball (baseball).
In other words, the speed of a Knuckleball (baseball) is 0.670 times 48.90 yards per second.
(a.k.a. knuckler, a.k.a. floater, a.k.a. dancer, a.k.a. butterfly ball) (major league average)
The average speed of major league knuckleball pitch is 33 yards per second. Eddie Cicotte, who was later implicated in the 1919 Black Sox scandal, is credited with developing the pitch ca. 1906.