"no meaningful differences in measures of rotational motion or acceleration for pitchers throwing from distances as far as 63 feet, 8 inches"
I find the same sort of verbiage in the 3 studies I have been able to access. A few definitions are in order.
"Velocity is the change in position (location) of an object per unit time."
"Acceleration is the change in velocity of an object per unit time."
When we say, "He throws a 95mph fastball!", we are referring to the velocity as measured by Statcast. Statcast measures velocity the moment the ball leaves the pitcher's hand. Assuming the same mechanics, this wouldn't change if the pitcher was in center field.
F = ma Newton's 2nd law states force is proportional to what is required for an object of constant mass to change its velocity. Rearranging gives a = F/m. The F is initially the force applied by the pitcher's throwing motion. After the ball(m) leaves his hand that force(F) is no longer applied. Now the ball is acted upon by the forces of gravity and the resistance of the space through which the ball travels. More distance means more time the ball is acted on by the negative forces of gravity and resistance.
Again, measuring the moment the ball leaves the pitcher's hand there would be no difference in a = F/m from 60' 6" or from center field.
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