1. The problem statement, all variables and given/known data A car is travelling at 120km/h when it slams on the brakes. How long is the skid mark if the coefficient of friction is 0.62?(hint: convert km/h to m/s) Given: initial velocity: 33.3m/s; final velocity: 0m/s; coefficient of fricition: 0.62 2. Relevant equations μ = Ffriction/Fnormal; a= Force/mass 3. The attempt at a solution Because of the absense of a time value, i'm finding it very difficult to use and displacement equation i've been given. I understand the the change in velocity (after being conversted to m/s) is 33.33m/s, but thats as far as i've gotten. I was wondering is anyone could help me derive some other variable: such as the change in time, or the acceleration, with the given data.