1. The problem statement, all variables and given/known data In terms of m_1, m_2, and g , find the acceleration of the first block in the figure . There is no friction anywhere in the system. http://session.masteringphysics.com/problemAsset/1038627/5/YF-05-71.jpg 2. Relevant equations 3. The attempt at a solution I know the answer is (2m_2_g)/(m_2_+4m_1_) My problem is I dont know where the 2 and the 4 are coming from. The only thing I can think of is because block 2 is connected to a pulley that is connected to another one you make times m_2_g by two, and because there are 4 objects with tension that makes m_1_a=(T/4), but that doesnt really make sense.