# 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?

##### 1 Answer

Mar 11, 2017

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

Force