Calculate the work done by the person in lifting the box
Answers
Answer:
The mechanical work done is the same; but people are not ideal machines, so we will always expend more energy than the amount of work that is done. Assuming that the force is applied in the direction of motion, you can calculate the mechanical work as Work done = Force x Distance. If two different machines are used to lift a box, it should require the same amount of work to get the box to the same height - the box will have the same potential energy due to gravity if it is moved to the same height:
Potential = m*g*h. So note that in your situation each person (or machine) is using a varying amount of force at different stages of the lift - it has to be less at the top of the lift, or the box would continue to go up! In this case you have to add the forces and the distances in small steps (an integral is the idealization of infinitely small steps). The work will be the same, but the power (rate of use of energy, energy per unit of time) is different.
⚡Hope it will be helpful.⚡
Explanation:
The work done by person lift a box is mgh and by the gravity so
Net work done in lifting a box is Zero.
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