The coefficient of kinetic friction between the tires of your car and the roadway is m.
(a) If your initial speed is v and you lock your tires during braking, how far do you skid? Give your answer in terms of v, m, and m, the mass of your car.
(b) If you double your speed, what happens to the stopping distance?
(c) What is the stopping distance for a truck with twice the mass of your car, assuming the same initial speed and coefficient of kinetic friction?