5. Block A weighs 45.0 N, and block B weighs 25.0 N. Once block B is set into downward motion, it descends at a constant speed. (a) Calculate the coefficient of kinetic friction between block A and the tabletop. (b) Suppose an object with a 45-N weight rests on top of block A. If block B is now set into downward motion, what is its acceleration (magnitude and direction)?

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