World problem for physics?
A 1255 kg Honda is going through a school zone at 5.0 x 101 km/h and then the driver quickly
steps on the brakes to make the car come to a complete stop by skidding 3.0 x 101 m. What is
the work done on the car by the frictional forces? (Hint: the answer is negative because the
force and the displacement are in the opposite directions.)
The work done by the forces on the Honda will equal the change in Kinetic Energy of the car
Change in Kinetic Energy = KEf - KEi
0 - 0.5(1255)(13.89)^2 = - 121065J ( I changed km/h to m/s to get joules for energy)
This is the work done by the forces that stop the car which is friction thus your answer.
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