1. The problem statement, all variables and given/known data The masses of blocks A,B, and C are 4kg, 10kg and 2kg respectively. Knowing that P=0 and neglecting the masses of the pulleys and the effects of friction, determine a) the acceleration of each block and the tension in the chord. 2. Relevant equations Fnet=ma 3. The attempt at a solution I know that we have to draw FBD's for each block and then figure out the equations of each Fnet. But first, how do you know the direction that this system will move? Because for example, if you know that block A is moving down, we can assume down is positive and its equation will be ma=mg-2T (because we denote down as positive)? Also, for block B, will the tension be 4T, since it's connected to four strings? I am confused about how system works. Thanks!