A car of mass is moving due east at

PHYSICS · Single correct · A Level · Physics · Mechanics and materials · Mechanics and materials

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}

(b)

4000\,\text{N}

(c)

2000\,\text{N}

(d)

10\,000\,\text{N}

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