Consider the system shown in the figure . Block A has weight wax and block B has weight WB. Once block B A is set into downward motion, it descends at a constant speed. Assume that the B mass and friction of the pulley are negligible. Part A Calculate the coefficient of kinetic friction / between block A and the table top. Express your answer in terms of some or all of the variables w A (double-u subscript A), WB, and g (the acceleration due to gravity). View Available Hint(s) W B WA Submit Previous Answers V Correct Part B A cat, also of weight WA, falls asleep on top of block A. If block B is now set into downward motion, what is the magnitude of its acceleration? Express your answer in terms of some or all of the variables WA, WB, and g (the acceleration due to gravity). View Available Hint(s) AEd ? a =