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[" ss "m" kg is lifted uniformly by a ma...

[" ss "m" kg is lifted uniformly by a man to a height of one metre in "30" sec.Ar "],[" ss uniformly to the same height in "60" sec.The work done on the bo "],[" are in ratio "],[[" (2) "H:1," (3) "2:1," (4) "4:1]]

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