19. As shown in Fig. 4, an m₁ = 1.0 kg block is placed on top of an m₂ = 8.0 kg block, which lies on a frictionless surface. The coefficient of kinetic friction between the two blocks is 0.20; they are connected via a pulley and a string. A hanging block of mass m₃ = 6.0 kg is connected to the mass m2 block via another pulley and string. Both strings are massless and the pulleys are frictionless. What is the acceleration magnitude of the blocks? (Gravitational acceleration g =9.8 m/s²) m1 m2 M3 Figure 4. A system composed of three blocks, strings, and pulleys.
(A) 3.7 m/s²
(B) 2.7 m/s²
(C) 9.7 m/s2
(D) 8.0 m/s²