Recently a friend and I were discussing a video on MLB.com about a 5 year old hitting a 90MPH fastball. I said no way would even have the arm strength to stop the ball let alone hit the ball. That started us wondering......... how much force is actually needed to make a 90MPH fast ball going in one direction, stop it, and send it careening in a totally new direction at say 60MPH? I bet a line driive has to be going at least that fast. So how bout it guys, anyone have or can owrk out an equation for that? Would love to really see how much force is required to hit off a MLB Pitcher!!!