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ridsyfootball

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## Homework Statement

A weight lifter (mass 75Kg) raises body's centre of mass by 0.4 in the process of lifting a barbell weight of 70kg to the height of 1.04m above the ground. Calculate the total work done in lifting the weight.The weight is raised in 0.2 seconds; hence calculate the power of the weight lifter.

## Homework Equations

m x a = f

F x s = work

Power= work done/time taken

## The Attempt at a Solution

70kg X 9.81 m/s = 686.7N

work= 686.7 X 1.04=714.168 j

How do i work out the distance travelled? the weight lifter wouldn't lift a barbell 1.04m.

power =714.168/0.2=1373.4 W