A string is wound round a uniform disc of radius 0.65 m and mass of 2.2 kg. The disc is free 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 beginning from rest, the center of the mass has drop 3 m. The acceleration of gravity is 9.8 m/s^2. Answer must be in units of m/s.\