Question

A child leaves her book bag on a slide. The bag, which is at the top of the slide, starts from rest and reaches the bottom in 1.63 s. The mass of the book bag is 2.55 kg, the length of the slide is 2.90 m and the angle of incline is 35.0°. (Assume the +x-axis to be parallel to and down the slide.)
(a) What is the friction force acting on the bag?
(b) What is the coefficient of kinetic friction between the bag and the slide?
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