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 down-

ward 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

A

B