Because pitchers are, actually higher than the hitters, and the ball is coming from above their heads, gravity adds force and speed to the ball as it travels downhill to the plate.
(pitchers; are; actually higher than the hitters) (the ball; is coming; from above their heads) (gravity; adds; force and speed; to the ball; T:as it travels downhill to the plate) (it; travels; downhill)
pitchers the ball gravity it
are is coming adds travels
actually higher than the hitters
from above their heads
force and speed to the ball T:as it travels downhill to the plate
downhill