A load of mass $1250{\text{ }}kg$ is raised by a crane from rest on horizontal ground, to rest at a height of $1.54{\text{ }}m$ above the ground. The work done against the resistance to motion is $5750{\text{ }}J$.
a) Find the work done by the crane.
b) Assuming the power output of the crane is constant and equal to $1.25{\text{ }}kW$, find the time taken to raise the load.
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