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A cord is used to lower vertically a block of mass `M`, a distance `d` at a constant downward acceleration of `(g)/(4)`, then the work done by the cord on the block isA. `mg d//4`B. `3 Mg d//4`C. `-3 Mg`D. `mg d` |
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Answer» Correct Answer - C `Mg - T = Ma = (Mg)/(4)` `T = (3 Mg)/(4)` `W = - T xx d = (-3 Mgd)/(4)` |
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