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A crane lifts a load of mass m = 500 kg vertically at constant speed
v = 2 ms-'. Find the power expended by the crane motor. What is the
work done by the crane if the load is lifted through h= 20 m? A second
cranc is able to lift the same load at twice the vertical speed. Find the power
expended and the work donc in lifting the load through the same height.
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