The string is wound about uniform disc of radius 0.65 m and mass of 2.2 kg. The disc is liberated from rest with the string vertical and its top end tied to the fixed support. Compute the speed of the center of mass when, after begining from rest, the center of the mass has fallen to 3 m. The accleration of gravity is 9.8 m/s^2. The answer must be in units of m/s.