Correction for the speed of a Curveball (baseball)
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How fast is 12,710,000 inches per hour?
It's about two-and-a-half times as fast as a Curveball (baseball)
The speed of a Curveball (baseball) is about 4,800,000 inches per hour.
(a.k.a. hook, a.k.a. hammer, a.k.a. yakker) (major league average)
The average speed of major league curveball pitch is 4,700,000 inches per hour. 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.