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8. As in the diagram at right, a uniform cylindrical spool of mass M and radius...

8. As in the diagram at right, a uniform cylindrical spool of mass M and radius R unwinds an essentially mass-less rope under the weight of a mass m. If R = 12 cm, M = 400 gm and m = 50 gm, find the speed of m after it has descended 50 cm starting from rest. Solve the problem using Newton's laws.

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