A driver in a 1000-kg car traveling at 24 m/s slams on the brakes and skids to a stop. If the coefficient of friction between the tires and the level road is 0.80, how long will the skid marks be?
A) 30 m
B) 34 m
C) 46 m
D) 37 m

Question

Quizplus · Accepted Answer

The work-energy principle can be used here. The initial kinetic energy is converted into work done against friction. The frictional force is the product of the normal force (equal to the weight of the car) and the coefficient of friction. Solving for the distance gives approximately 37 m.

A Driver in a 1000-Kg Car Traveling at 24 M/s