A solid cylinder of mass 50 kg and radius 0.5 m is free to rotate about the horizontal axis. A massless string is wound round the cylinder with one end attached to it and other hanging freely. Tension in the string required to produce an angular acceleration of 2 revolutions s -2 is :-

1. A. 25 N
2. B. 50 N
3. C. 78.5 N
4. D. 157 N

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