Question
A crane lifts a $750-\mathrm{kg}$ girder $8.85 \mathrm{~m}$. How much work does the crane do lifting (a) at constant speed and(b) with upward acceleration $1.20 \mathrm{~m} / \mathrm{s}^{2} ?$
Step 1
In this case, the work done by the crane is equal to the work done against gravity, which is given by the formula $W = mgh$, where $m$ is the mass, $g$ is the acceleration due to gravity, and $h$ is the height. Show more…
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