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Correction for the speed of a Knuckleball (baseball)
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How fast is 139 inches per second?
It's about one-tenth as fast as a Knuckleball (baseball)
The speed of a Knuckleball (baseball) is about 1,200 inches per second.
(a.k.a. knuckler, a.k.a. floater, a.k.a. dancer, a.k.a. butterfly ball) (major league average)
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