What average force is required to stop a 1600 kg car in 9.0 s if the car is traveling at 85 km h?

The acceleration of the car is

Therefore, from Newton’s second law, you get that the average force on the car is

(Negative value of the average force means that the average force is against the direction of the initial velocity.)

Hence, the average force on the car is 3135 N.

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