1. The problem statement, all variables and given/known data 2. Relevant equations F = m*a 3. The attempt at a solution M_c * g - T = M_c * a_c M_a * a_a = T/2 M_b * a_b = T/2 I have how to combine these equations to give me an answer for each acceleration. There is a solution http://physics141.uchicago.edu/2002/hw2.pdf" [Broken], but I do not understand how it is set up and why it is so different from my setup.