1. The problem statement, all variables and given/known data What is the acceleration of this system? 2. Relevant equations F=ma 3. The attempt at a solution I tried the following: Let blocks with mass 9kg, 4kg and 6kg be m9, m4, m6 This is the free body diagrams I drawn: Then I applied Newton's 2nd Law: F = ma (For m9) mg-TR=9a (For m4) TR-TL=4a (For m6) TL-w*sin(30)=6a I solved for a and it didn't gave the right answer. What I am doing wrong?