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How fast is 0.02 mach?

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It's about one-third as fast as a Greyhound.
In other words, the speed of a Greyhound is 3.03 times 0.02 mach.
(a.k.a. English greyhound) (approximate maximum speed)
Greyhounds reach average race speeds of 0.0607 mach. 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 three-tenths as fast as a Gazelle.
In other words, the speed of a Gazelle is 3 times 0.02 mach.
(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 0.07 mach. 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 three-tenths as fast as a Hare.
In other words, the speed of a Hare is 3 times 0.02 mach.
(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 0.06 mach. 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-and-a-half times as fast as Michael Phelps.
In other words, 0.02 mach is 3.41370 times the speed of Michael Phelps, and the speed of Michael Phelps is 0.292940 times that amount.
(at the Beijing Olympics, 2008; 200 m freestyle) (a.k.a. Michael Fred Phelps) (swimmer; 1985-)
Setting a world record, Michael Phelps swam the 200 m freestyle in 1:42.96 for an average speed of 0.0058588 mach. Phelps would go on to win nine gold medals individually in the 2008 Olympics - more than all but eight of the competing nations.
It's about one-fifth as fast as a Knuckleball (baseball).
In other words, 0.02 mach is 0.220 times the speed of a Knuckleball (baseball), and the speed of a Knuckleball (baseball) is 4.50 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 0.092 mach. Eddie Cicotte, who was later implicated in the 1919 Black Sox scandal, is credited with developing the pitch ca. 1906.
It's about one-fifth as fast as a Cheetah.
In other words, 0.02 mach is 0.21610 times the speed of a Cheetah, and the speed of a Cheetah is 4.6270 times that amount.
(Acinonyx jubatus)
The cheetah can reach speeds of up to 0.09258 mach in short bursts. From a crouching position, the cheetah can attain these speeds in just 2.25 seconds.
It's about one-fifth as fast as a Curveball (baseball).
In other words, the speed of a Curveball (baseball) is 5 times 0.02 mach.
(a.k.a. hook, a.k.a. hammer, a.k.a. yakker) (major league average)
The average speed of major league curveball pitch is 0.10 mach. 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.