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A yo-yo is made of two solid cylindrical disks, each of mass 4.7×10−2 kg and diameter...

A yo-yo is made of two solid cylindrical disks, each of mass 4.7×10−2 kg and diameter 7.0×10−2 m, joined by a (concentric) thin solid cylindrical hub of mass 5.0×10−3 kg and diameter 1.2×10−2 m.

Part A: Use conservation of energy to calculate the linear speed of the yo-yo just before it reaches the end of its 1.1-m-long string if it is released from rest. (Express your answer using two significant figures.) The answer is V = 1.1 m/s

Part B: What fraction of its kinetic energy is rotational? (Express your answer using two significant figures.) I got 0.94 & 0.91 for my answers but both were incorrect.

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