10. 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 ㆍ 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?

(A) 10.83 s
(B) 3.98 s
(C) 1.14 s
(D) 5.59 s
(E) 7.89 s.
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統計: A(1), B(12), C(2), D(0), E(0) #3093851
統計: A(1), B(12), C(2), D(0), E(0) #3093851