A car with a mass of #1000kg# initially moving at a rate of #20m/s# rolls to a stop. What is the work done by friction? What is the force of friction if it takes a distance of #20m# for the car to stop?
When a car with a mass of
Change in Kinetic energy of car
This loss of energy is the work done by friction
Using the kinematic expression and assuming that deceleration is constant
we get acceleration as
Using Newton's Second Law of motion, we get