10. In the figure, a mass of 31.77 kg is attached to a light string that is wrapped around acylindrical spool of radius 10.0 cm and moment of inertia 4.00 kg ㆍ m2. The spool issuspended from the ceiling, and the mass is then released from rest a distance 5.70 mabove the floor. How long does it take to reach the floor?