Estimate the coefficient of static friction

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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 30°, the box starts to slip, and it slides 2.5 m down the plank in 3.7 s at constant acceleration.

(a) What is the coefficient of static friction?

(b) What is the coefficient of kinetic friction?

Reference no: EM13503549

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