7.3 kg box slides across the floor, experiencing a force of friction of 17.885 N [backward]. Determine the coefficient of kinetic friction between the box and the floor. What are the materials of the box and the floor? (use the chart attached here)

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Newton's First Law of Motion

If a very smooth ball is rolled down an inclined surface with zero friction, the ball will continue to roll indefinitely for an infinite time, in an attempt to reach to the same height on the opposite hill!