What is the coefficient of friction for the care tires? I'm lost and confused

. The first step in determining fault at the crash scene is to determine the coefficient of friction between the tires and the road. Here is what you know . 1. A team was sent to the scene to complete the data collection needed for you to determine the coefficient of friction. To do this, the data collector drags a 13.265kg tire across the pavement. The force meter shows a force of 100N is needed to drag the car tire at constant velocity. We also know that the coefficient of friction for the truck's tires is only 70% of the value for the car's tires. Calculate the coefficient of friction for the car tires. There are points assigned for your work as well as the