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 ok, i think i figured it out but i'm not sure how let me try to break it down again so if Fgravity is -9.8 then the Fnormal is 9.8? so is Ffriction = u * Fnormal? which is 1.176 is a? and then i used vf - vi / 2a which gave me 140.689 did i get it or was this a lucky guess?