Hey all, I am new to Physics. Recently changed majors from technical writing to physics for the amount of interest I have in the subject. I have been doing ok but I missed a couple of questions on my last homework and I feel that I should have had somebody check my general solved statements after I finished to make sure that I was correct. Anyways, enough about me! 1. The problem statement, all variables and given/known data What is the greatest acceleration a runner can muster if the friction between her shoes and the pavement is 90% of her weight? 2. Relevant equations F = ma .9%*9.8 m/s http://img183.imageshack.us/img183/8439/accelerationrn5.png [Broken] 3. The attempt at a solution I figure since the force is her body moving at a constant velocity that the greatest acceleration she could reach would be 8.82 m/s. I also tried to make this using Newtons Second Law of a = Fnet/m but what would the net force be equal to? 90%? Any and all help is appreciated, but please post in user friendly terms as I am not that familiar with heavy physics terms yet as I have seen in some other topics(but not all).