X Consider the system shown in the figure . Block A (5 kg) and block B (2 kg). Once block B is set into downward motion, it descends at a constant speed. Calculate the coefficient of kinetic friction between block A and the tabletop. A O 0.2 O -0.5 O 1.0 0 0.4 O 0.8 D Question 13 1 pts Following the last problem. Now, a cat, of mass 5 kg, falls asleep on top of block A. If block B is now set into downward motion, what is its acceleration magnitude and direction? ( free-fall acceleration g = 9.8 m/s^2) O 0.25 m/s^2, upward 1.63 m/s^2, upward