A block of mass 'M' is lowered with the help of a rope of negligible mass through a distance 'd' with an acceleration of g/3 . Work done by the rope on the block is
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a
2mgd3
b
-2mgd3
c
mgd3
d
-mgd3
answer is B.
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Detailed Solution
Tension in the ropeT = Mg - Mg/3 = (2/3) mg.: W = T⇀.S⇀= TS cos 1800=2mgd3-1