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150 kilometers per hour is about one-and-two-fifths times as fast as a Knuckleball (baseball).
In other words, the speed of a Knuckleball (baseball) is 0.710 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 110 kph. Eddie Cicotte, who was later implicated in the 1919 Black Sox scandal, is credited with developing the pitch ca. 1906.
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