1. The problem statement, all variables and given/known data "what is the maximum speed at which a car can safely travel if the radius of the track is 80.0 m and the coefficient of friction is .40" friction is providing the force and the track is flat and circular. 2. Relevant equations the equations that we've been using in class are: Fnet=ma a= V^2/r w=mg force of friction= (coefficient of friction)(normal force) 3. The attempt at a solution I set up the Newton's Second Law for centripetal force (Fnet=ma) and know that the Fnet would be the coefficient times the normal force. I set up the acceleration equation (a=V^2/r). But I'm confused about finding the normal force without a mass. I know that velocity is distance divided by time and that the distance would be 2∏r, but I don't know how you would find it that way without time. What am I missing?