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How fast is 20 yards per second?

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It's about one-and-one-tenth times as fast as Secretariat.
In other words, 20 yards per second is 1.09 times the speed of Secretariat, and the speed of Secretariat is 0.9170 times that amount.
(at Belmont Stakes, 1973)
Setting a record finish, Secretariat ran the Belmont Stakes — a 12 furlong race length — in 2:24, for an average speed of 18.30 yards per second in 1973. His margin of victory in the race, also a record-setter, was 31 lengths.
It's about nine-tenths as fast as a Greyhound.
In other words, 20 yards per second is 0.910 times the speed of a Greyhound, and the speed of a Greyhound is 1.10 times that amount.
(a.k.a. English greyhound) (approximate maximum speed)
Greyhounds reach average race speeds of 22 yards per second. Despite their racing prowess, greyhounds are not considered energetic dogs — the typical greyhound race requires the dogs to run for less than 35 seconds.
It's about nine-tenths as fast as a Gazelle.
In other words, the speed of a Gazelle is 1 times 20 yards per second.
(for Thomson's Gazelle, a.k.a. Eudorcas thomsoni, a.k.a. "Tommie", a.k.a. "Tommy")
A Thomson's gazelle can reach speeds of up to 20 yards per second. The gazelle's speed doesn't match that of its chief predator, the cheetah, but a gazelle's endurance usually ensures an escape in distances greater than 500 m (0.3 mi).
It's about nine-tenths as fast as a Hare.
In other words, the speed of a Hare is 1 times 20 yards per second.
(for European Brown Hare, a.k.a. Brown Hare, a.k.a. Lepus europaeus, a.k.a. Brown Hare)
The European Hare can run at speeds of up to 20 yards per second. While speed is a factor in their escapes, hares evade their chief predators — wolves, foxes, and golden eagles — by fleeing in a zigzag pattern.
It's about three-fifths as fast as a Knuckleball (baseball).
In other words, 20 yards per second is 0.610 times the speed of a Knuckleball (baseball), and the speed of a Knuckleball (baseball) is 1.60 times that amount.
(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.
It's about three-fifths as fast as a Cheetah.
In other words, 20 yards per second is 0.59590 times the speed of a Cheetah, and the speed of a Cheetah is 1.6780 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-three-fourths times as fast as Michael Johnson.
In other words, 20 yards per second is 1.7670 times the speed of Michael Johnson, and the speed of Michael Johnson is 0.56590 times that amount.
(a.k.a. Michael Duane Johnson) (sprinter; 1967-) (at the Atlanta Olympics, 1996)
Setting a record that stood for 12 years, Michael Johnson ran a 200 m in 0:19.32 for an average speed of 11.320 yards per second at the 1996 Olympics. Johnson was nicknamed "the Man with the Golden shoes" in recognition of the custom footwear worn during these races — a pair of Nikes with a left size of 10.5 and a right size of 11.