So I've been busting my head for the past 2 days trying to figure out what I was doing wrong and I just can't. I have a whole bunch of these types of questions and can't solve any of them. My own equations and reasoning make sense to "me" but don't lead me to the right answer. I am positive I'm overlooking some huge thing. Please help! 1. The problem statement, all variables and given/known data a 1250kg car traveling at 16.67m/s comes to a sudden stop in 35m. Find the coefficient of friction acting on the brakes. Vi: 16.67m/s Vf: 0m/s m: 1250kg a: (found), -3.969 g: 9.81m/s2 d: 35m 2. Relevant equations Fnet(x)=ma Fnet(x)= Fa-[itex]\mu[/itex]Fn Fa-[itex]\mu[/itex]Fn = ma 3. The attempt at a solution Going insane!:surprised See attached doc... Thanks again guys!