Physics

Problem

A car of mass

1000\,\text{kg}

is moving due east at

20\,\text{m\,s}^{-1}

. The driver applies the brakes so that the car comes to rest uniformly in

5\,\text{s}

. What is the magnitude of the average braking force exerted on the car? a)

8000\,\text{N}

4000\,\text{N}

2000\,\text{N}

10\,000\,\text{N}