A student of university physics who is transporting a heavy wooden box is becoming cognizant of friction. This student briefly shifts the burden by pressing the box against a wooden wall with a force, Fapp, applied at an angle 0 above the horizontal, as shown in the figure. Assume that the box slides with a small but constant speed up the wall to a point where the student can grip it more comfortably. The coefficients of static and kinetic friction are μs and μk, respectively. Fapp To

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