I am recreating a car accident, an inelastic collision. The two vehicles after the collision have an initial velocity of 21.69m/s. They skid 6m across asphalt with coefficient of friction value of 0.72. They then pass through 0.5m of gravel with a coefficient of friction value of 0.4. Finally they continue through grass with a coefficient of friction value of 0.35 until they come to rest. The two vehicles have a combined mass of 4,151kg. Gravitational value is 9.81 I am required to discover how far the cars travel through the grass until they come to rest. All formulas and equations would be helpful. u = √ 2 μ g s ????