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A student wants to determine the coefficients of static friction and kinetic friction between a box and a plank. She places the box on the plank and gradually raises one end of the plank. When the angle of inclination with the horizontal reaches 28.0°, the box starts to slip and slides 2.53 m down the plank in 3.92 s. Find the coefficients of friction.
Therefore, the coefficient of static friction between the plank and the box is 0.53 .Therefore, the coefficient of kinetic friction between the plank and the box is 0.49 .
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