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A car with its driver has a mass of 1400 kg. It brakes until it reaches...

A car with its driver has a mass of 1400 kg. It brakes until it reaches rest from a speed of 86 km/h, covering a distance of 180 m. What is the resulting frictional force (external f) that the road exerts on the tires during the process, if we assume that the tires do not slide?

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