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A cord of negligible mass is wound round the rin of a flywheel of mass 20 kg and radius 20 cm. A steady pull of 25 N is applied on the cord. The work

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A cord of negligible mass is wound round the rin of a flywheel of mass 20 kg and radius 20 cm. A steady pull of 25 N is applied on the cord. The work done by the pull when 2 m of the cord is unwound is
A. 20 J
B. 25 J
C. 45 J
D. 50 J
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Correct Answer - d
Work done by the pull unwinding 2m of the cord,
W`=25 N xx 2 m= 50 J`
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