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A mass m hangs with the help of a string wrapped around a pulley on a frictionless bearing. The pulley has mass m and radius R. Assuming pulley to be a perfect uniform circular disc, the acceleration of the mass m, if the string does not slip on the pulley, is :

1. 3 g 2
2. g
3. 2 g 3
4. g 3

Correct answer: 2 g 3

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