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circular solid disc

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  1. A circular solid disc of uniform thickness 20mm radius 200mm and mass 20kg, is used as a fly wheel. If it rotates at 600 rpm, the kinetic energy of the flywheel, in joules                                                                          

      (a) 395                                                                (b) 790

      (c) 1580                                                              (d) 3160

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