32 mi/hr 5 100
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The hydraulic braking system for the truck and trailer is set to produce equal braking forces for the two units. If the brakes are applied uniformly for 8 seconds to bring the rig (truck and trailer) to a stop from a speed of 32 mi/hr down the 5-percent grade, determine the force P in the coupling between the trailer and the truck. The truck weighs 19,000 lbs and the trailer weighs 15,000 lbs. State whether the coupling is in tension or compression.
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