Originally Posted by

**topsquark** What Quick did was okay, but he got some postives and negatives screwed up. I'm not razzing him for it, it's a common mistake.

For starters, Quick WAS using your formula. Apparently he didn't know the variables so he used words instead.

(Edit: I looked at Quick's work again and, for some reason, the equation he was using has an extra negative sign all throughout it. Mathematically it is the same as the displacement equation used here, but in terms of the Physics I can't make any sense out of it.)