Consider the system below consisting of a rough surface, three masses, a massless string, and a massless and frictionless pulley. The mass of each block is m. = 12.5 kg, mb = 15.0 kg, and m. = 13.5 kg. The coefficients of static and kinetic friction are 0.75 and 0.35, respectively for all surfaces. The masses are given a quick push so that m. is initially moving downwards. a. Calculate the magnitude of the acceleration of ma• b. Is m. slowing down or speeding up? Explain. For part c, consider m, is replaced with a new, variable mass. c. What is the largest value m, can have for the system to remain stationary?

Consider the system below consisting of a rough surface, three masses, a massless string, and a massless and frictionless pulley. The mass of each block is m. = 12.5 kg, mb = 15.0 kg, and m. = 13.5 kg. The coefficients of static and kinetic friction are 0.75 and 0.35, respectively for all surfaces. The masses are given a quick push so that m. is initially moving downwards. a. Calculate the magnitude of the acceleration of ma• b. Is m. slowing down or speeding up? Explain. For part c, consider m, is replaced with a new, variable mass. c. What is the largest value m, can have for the system to remain stationary?