You lift a box of mass m from the ground placing it at rest on a shelf at a height h. Taking the box and the earth to be the "system", the change in total energy is numerically equal to
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Step 1
When you lift the box, you do work on it, which increases its potential energy. The work done is equal to the force you apply (which is equal to the weight of the box, mg) multiplied by the distance it is lifted (h). So the work done is W = mgh. Show more…
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