Article: Ball Exit Speed Ratio (BESR).(baseball)

The NCAA requires that all nonwood bats be certified so as to limit their "liveliness." The certification process is accomplished by measuring the performance of a bat under controlled conditions and then assigning a number to it; this number is known as the BESR (Ball Exit Speed Ratio). To be certified, the BESR of the bat must fall at or below a predetermined value set by the NCAA. This paper discusses the concept of the BESR.

THE BALL-BAT COLLISION

Figure 1 shows a ball and a bat just before the collision and the ball just after the collision (the position of the ball after the collision has been moved downward for the sake of clarity). The speeds ...

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