Must use only the work-energy theorem, conservation of energy, and/or conservation ofmomentum. 1) A 13.5-kg box slides over a rough patch 1.75 m long on a horizontal floor. Just before entering therough patch, the speed of the box was 2.25 m/s, and just after leaving it, the speed of the box was 1.20m/s. The magnitude of the average force that friction on the rough patch exerts on the box is:

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