5. Consider the system shown in the figure. Block A has a weight 𝑤𝐴 and block B has a weight 𝑤𝐵. 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 𝑤𝐴, falls asleep on top of block A. If block B is now set into downward motion, what is its acceleration (magnitude and direction)?
(a) Deceleration with constant speed means equilibrium of forces:
(b) Write equations by Newton's second law for the scenario with cat:
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