1. The problem statement, all variables and given/known data The weights of the blocks are W_A = 120 lb and W_B = 20 lb, and the surfaces are smooth. Find the acceleration of block A. [A picture is shown. Block A is connected via rod to a pulley, and Block B is hanging from the pulley via cord.] 2. Relevant equations F=ma 3. The attempt at a solution This is embarrassing. I feel like I'm having a brain fart. I did free body diagrams showing that T-W_B=(M_A)a, and that T=(M_B)a, and substituted them into equations, but the book says it's the wrong answer; I should be getting 4.02 ft/s^2, but I'm getting something different. Any help please?