Motion Exercises 163 7. (10 pts) In the figure, a mass of 31.77 kg is attached to a light string that is wrapped around a cylindrical spool of radius 10.0 cm and moment of inertia 4.00 kg-m². The spool is suspended from the ceiling, and the mass is then released from rest a distance 5.70 m above the floor. How long does it take to reach the floor? R= 10 cm=.10m M- M= 31.77kg I=4kg m t? -5 v=rw 1.14 s B) 5.59 s C) 3.83 s D) 7.89 s E) 3.98 s U₁=K2 2+ y Check