5.34

•• Consider the system shown in Fig. E5.34. 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) A cat, also of weight 45.0 N, falls asleep on top of block A. If block B is

now set into downward motion, what is its acceleration (magnitude and direction)?

Figure E5.34

B