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A YO-YO of mass M and moment of inertia ...

A YO-YO of mass M and moment of inertia I about its c.m. is having a shaft of radius r around which a string is wound. The YO-YO starts from rest and unwinds itself. Show that the tension in the string during descent is given by `((MgI)/( Mr^(2) + I))`

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The correct Answer is:
`(MgI)/( Mr^(2) + 1)`
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