49. Two blocks, m1= 1.0 kg and m2 = 2.0 kg, are connected by a light string as shown right. If the radius of the pulley is 1.0 m and its moment of inertia is 5.0 kg ㆍ m2, the acceleration of the system is 
(A) g/6
(B) 3g/8
(C) g/8
(D) g/2
(E) 8g/5
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統計: A(0), B(2), C(16), D(0), E(0) #3081289
統計: A(0), B(2), C(16), D(0), E(0) #3081289