Question

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?

Answer 1

Answer:652.05 J

Step-by-step explanation:

Given

Weight of lifter
`W=345 N`

vertical distance move
`h=1.89 m`

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

Change in Potential Energy
`=m g h`

`\Delta PE=345 * 1.89=652.05 J`

therefore work done is equal to
`652.05 J`