Chapter 8, Problem 44P

* You have an Atwood machine (see Figure 4.9) with two blocks each of mass m attached to the ends of a string of length l. The string passes over a frictionless pulley down to the blocks hanging on each side. While pulling down on one block, you release it. Both blocks continue to move at constant speed, one up and the other down. Is the system still in equilibrium? Find the vertical component of the center of mass of the two-block system. Indicate all of your assumptions and the coordinate system used.