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A trailer truck enters a 2 percent downhill grade

A trailer truck enters a 2 percent downhill grade traveling at 108 km/h and must slow down to 72 km/h in 300 m. The cab has a mass of 1800 kg and the trailer 5400 kg. Determine (a) the average braking force that must be applied, (b) the average force exerted on the coupling between cab and trailer if 70 percent of the braking force is supplied by the trailer and 30 percent by the cab.

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