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A machine with v.r 5 was used to raise a load of 1.2kg mass through high of 10m. If the workdone to raise the load is 800j find usefull work output, find efficiency,and m.a of the machine

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work output = m g h = 1.2 * 9.81 * 10 = 117 Joules
efficiency = 117/800 = .147 = 14.7%

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