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A plank with a box on it at one end is gradually raised about the other end. As the angle of inclination with the horizontal reaches $30^°$ , the box starts to slip and slides 4.0 m down the plank in 4.0 s. The coefficients of static and kinetic friction between the box and the plank will be, respectively: [Diagram: A box on an inclined plane at angle theta]

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