1. The problem statement, all variables and given/known data One end of a light inextensible string is attatched to a 4kg mass on a smooth horizontal table. The string passes over the edge of the table and to it's other end is attatched a light smooth pulley. Over this pulley passes another light inextensible string, with masses of 3kg and 2kg attatched to it's ends. If the system is allowed to move freely, show that the 4kg mass moves with acceleration of 6g/11. 2. Relevant equations 3. The attempt at a solution http://img247.imageshack.us/img247/8569/diagramjy9.th.jpg [Broken] I'm having a bit of a problem from the outset getting the equations of motion. I don't think the diagram is correct. I feel like there should be another acceleration representing the movement of the pulley against the 4m mass, but i'm not sure how to represent it (and part of me thinks that it's covered by the tension t1. Any help on setting out the problem would be appreciated.