no, i just didn't bother to type the equation. still disagree: batters are actively watching the ball and anticipating. with rockfall you have to hear it, process what you are hearing, turn your head to look, find the object, asses it's trajectory, make a reaction plan, and then move. At 9.8m/s^2 it will be traveling fast. I do agree with sliding rock - i'm talking a straight shot.