A cord is used to lower vertically a block of mass \( \mathrm{m} \) by a distance \( \mathrm{d} ...

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A cord is used to lower vertically a block of mass \( \mathrm{m} \) by a distance \( \mathrm{d} \) with constant downward acceleration \( \frac{\mathrm{g}}{4} \). Work done by the cord on the block is
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