The two masses (mA = 6.50 kg is hanging and MB = 3.30 kg is on the floor) in the Atwood's machine shown in the figure below are released from rest, with m A at a height of 0.865 m above the floor. When m A hits the ground its speed is 1.89 m/s. The pulley is not massless and can be considered a solid disk with a moment of inertia of (1/2)mpr2. (Figure 1) Figure