1. The problem statement, all variables and given/known data A flat (unbanked) curve on a highway has a radius of 260 m. A car rounds the curve at a speed of 18.0 m/s . What is the minimum coefficient of friction that will prevent sliding? 2. Relevant equations A= v2/R I got the acceleration but the problem does not give the mass for caluculating the normal force 3. The attempt at a solution 1.246 m/s is what I got for the acceleration after that I do not know what I should be doing.