Quote:
Originally Posted by Big Slick
...technically you have an acceleration = zero as my engineer friend of mine told me...
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No, to be stopped, technically, you have velocity = 0. Acceleration (rate of change of velocity) may or may not be zero, and it certainly will NOT be zero at the first instant of v=0. Also, physics only requires you to go through at least a fractional time where v=0 if you change directions from a single point. Unless a runner reverses direction, it is unlikely she stopped on a single point; more likely she did maintain some forward velocity.
Regardless, I seriously doubt the NCAA rule book meant for umpires to refer to Newtonian Physics to make a judgment. It is more likely "stop" means "visibly stop."