A cinder block of mass m = 4.0 kg is hung from a nylon string that is wrapped around a frictionless pulley having the shape of a cylindrical shell,as shown in the figure.If the cinder block accelerates downward at 4.90 m/s2 when it is released,what is the mass M of the pulley? 
A) 2.0 kg
B) 4.0 kg
C) 6.0 kg
D) 8.0 kg
E) 10 kg
Correct Answer:
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