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We have a car of mass 2,208 kg travelling down Route 38 at 5.2 m/s. The...

We have a car of mass 2,208 kg travelling down Route 38 at 5.2 m/s. The driver sees the Hartford Rd. stoplight turn red and brings the car to a stop in 7.1 s. What was the average amount of force applied by the brakes?

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Answer #1

Initial velocity, u = 5.2 m/s
Final velocity, v = 0
Time taken, t = 7.1 s
Average acceleration, - a = - (v - u) / t
= (5.2 - 0) / 7.1
= 0.732 m/s2

Average force = ma
Where m is the mass of the car
= 2208 * 0.732
= 1617 N

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