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# A massless string is wrapped around a disc of mass M and radius R. Another end is tied to a mass m which is initially at height h from ground level as shown in the figure. If the mass is released then its velocity while touching the ground level will be :√2gh√2ghMm√2ghmM√4mgh2m+M

A
2ghMm
B
2gh
C
2ghmM
D
4mgh2m+M
Solution
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#### Let the tension in the string be T.

3
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