An automobile of mass 1 200 kg is moving on a level road with a speed of 72 km/h.
a. (a) Calculate its kinetic energy in joules.
b. (b) The driver applies the brakes and brings the car to rest. How much work must be done by the braking system?
c. (c) If the average retarding force exerted by the brakes is 6 000 N, find the distance through which the car travels before coming to rest.