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The string in a yo-yo is wound around an axle of radius 0.521 centimeter. The yo-yo has both rotational and translational motion, like a rolling object, and has mass 0.389 kilogram and outer radius 1.98 centimeter. Starting from rest, it rotates and falls a distance of 1.28 meter (the length of the string). Suppose for simplicity that the yo-yo is a uniform circular disk and that the string is thin compared to the radius of the axle.
(a) Compute what is the speed of the yo-yo when it reaches the distance of 1.28 meter?
(b) Determine how long does it take to fall? [Hint: The translational and rotational kinetic energies are related, but the yo-yo is not rolling on its outer radius.]
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