The figure shows two blocks connected by a light cord over a pulley. This apparatus is known as an Atwood's machine. There is no sipping between the cord and the surface of the pulley. The pulley itself has negligible fition and it has a rdius of 0.12 m and a mass of 10.3 kg. We can model this pulley as a solid uniform disk. At the instant that the heavier block has descended 1.5 m starting from rest, what is the speed of the lighter block. (M1= 3.0 kg & M2=5.7 kg)