1.The weight lifter is bench-pressing a barbell whose weight is 710 N. Then raises the barbell with a distance of 0.65 m above his chest, and then he lowers it with the same distance. The weight is raised and lowered at a constant velocity. Determine the work done on the barbell by the weight lifter during (a) the lifting phase and (b) the lowering phase.

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Chapter5: Energy
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1.The weight lifter is bench-pressing a barbell whose weight is 710 N. Then raises the barbell with a distance of 0.65 m above his chest, and then he lowers it with the same distance. The weight is raised and lowered at a constant velocity. Determine the work done on the barbell by the weight lifter during (a) the lifting phase and (b) the lowering phase.

 

 

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