An Atwood machine consists of two masses connected by a cable wrapped over a pulley. M1 = 75.0 kg and M2 = 30.0 kg. The system is released from rest. Neglect friction and the mass of the cable. a) Use the conservation of mechanical energy to determine the acceleration of the masses after they have moved 2.0 m. b) Does this pulley offer a mechanical advantage? Briefly explain. c) Eventually the cable breaks and M1 falls onto a spring directly below it. The spring compresses 5.5 cm. What is the spring constant of this spring? 2