Block A has weight wA and block B has weight wB. Once block B is set into downward motion, it descends at a constant speed. Assume that the mass and friction of the pulley are negligible. Calculate the coefficient of kinetic friction μ between block A and the table top.
The top carton has a mass of 27 kg and the mass of the bottom carton is 22 kg. The coefficient of static friction between the bottom carton and the truck is 0.42, and the coefficient of kinetic friction for that surface is 0.35. The coefficient of static friction between the cartons is 0.40, and the coefficient of kinetic friction is 0.32.