1. The problem statement, all variables and given/known data The system of masses M1, M2, and M3 in the sketch uses massless pulleys and ropes. The horizontal table is frictionless How are the accelerations related? 2. Relevant equations 3. The attempt at a solution I feel like the solution will come from the constraint equation involving the string of the pulley system. However, I am not sure how to do this. It seems that since M1 and M2 are different masses, they do not have to accelerate at the same rate, which means that M3 would have all kinds of funky motion, not just linear in the y-direction. How do I think about this problem?