STANDARD Physics Work Done by a Force MCQ Question
A cord of negligible mass is wound round the rim 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
20 J
25 J
45 J
50 J
Correct Answer
Detailed Explanation
Work done by the pull unwinding 2 m of the cord, W = 25 N × 2 m = 50 J.
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