A string is wrapped around a uniform cylinder of mass M and radius R. (very confused plz help)?

. A string is wrapped around a uniform cylinder of mass M and radius R. The cylinder is released from rest with the string vertical and its top end tied to a fixed bar. Show that (a) the tension in the string is one-third the weight of the cylinder, (b) the magnitude of the acceleration of the center of... show more . A string is wrapped around a uniform cylinder of mass M and radius R. The cylinder is released from rest with the string vertical and its top end tied to a fixed bar.

Show that
(a) the tension in the string is one-third the weight of the cylinder,
(b) the magnitude of the acceleration of the center of gravity is 2g/3, and
(c) the speed of the center of gravity is (4gh/3)1/2 after the cylinder has descended through distance h. Verify your answer to (c) with the energy approach
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