At http://www.pitchingmachinepro....hine-Speeds-s/31.htm they state that you should us a D/SxT formula to calculate the equivalent pitch speed.
Everywhere I look it is basically the same, they use 60 ft in the equation for the high school formula. Knowing that the distance from the pitching rubber to home plate is 60' 6", the FBI would call that a clue.
However here is where I question the formula. The pitcher does not throw the ball from the rubber, by the time the ball is released the ball is about 10 feet in front of the rubber.
So should the formula not be 50/40x56= for a 70 mph equivalent? For a pitching machine set up 40 feet away launching balls at 56 mph. Or should we stick with the original 60/40x56= 84 mph?
Just thinking here. Any math majors fell free to help me out.