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Question

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 :

148632_87edbb03ab4648f3a79108f4d9c685c3.png
  1. 2gh
  2. 2ghMm
  3. 2ghmM
  4. 4mgh2m+M

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

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