1. The problem statement, all variables and given/known data Police lieutenants, examining the scene of an accident involving two cars, measure the skid marks of one of the cars, which nearly came to a stop before colliding, to be 85 m long. The coefficient of kinetic friction between rubber and the pavement is about 0.70. Estimate the initial speed of that car assuming a level road. 2. Relevant equations Fnet=ma Ff=(coefficient of kinetic energy) Fn vf = vi + at 3. The attempt at a solution i have no idea what to do since none of the formulas work with the knowns.