A car driver has rear ended a truck but claims he was drivingthe speed limit before hitting the brakes. The driver left a 50mlong streak of tire rubber when he slammed on the brakes. The massof the drivers car is 1000kg. The coefficient of friction betweenthe tire and asphalt is 0.5. The mass of the truck that got hit is5000kg. The speed limit for the road is 40mph. What was themagnitude of the acceleration of the car? (Remember that magnitudesare always positive). How fast was the car going right before thedriver slammed on the brakes?
