I was given this problem below in my physics homework. :yuck: http://www.turbozcar.com/images/knight.Figure.08.40.jpg [Broken] It wants to know the acceleration of m1. I couldn't figure it out, so the next day a friend in class gave me the answer to be: (2*m_2*g)/(4*m_1+m_2) I took that answer back to my house and was going to work it out to understand it all. I got my girlfriend to help me out, but neither of us can get the answer to come out correctly. We both get: (m_2*g)/(2*m_1+m_2) I don't know where we are going wrong. What I know: the forces acting on m_1 is the tension in the rope. The forces acting on m_2 is gravity (m_2*g) and then two tension forces acting upward. If I'm missing something, please let me know. I have a test tomorrow on tthis.