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A weight lifter lifts a 345 N set of weights from ground level to a position over his head, a vertical distance of 1.89 m. How much work does the weight lifter do, assuming he moves the weights at constant speed?

Respuesta :

Answer:652.05 J

Explanation:

Given

Weight of lifter [tex]W=345 N[/tex]

vertical distance move [tex]h=1.89 m[/tex]

Work done in lifting the weight is equal change in Potential Energy of weight

Change in Potential Energy [tex]=m g h[/tex]

[tex]\Delta PE=345 \times 1.89=652.05 J[/tex]

therefore work done is equal to [tex]652.05 J[/tex]  

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