- #1

MathMajor

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## Homework Statement

How much power does a weightlifter expend when lifting a 50kg barbell a distance of 1.2m in a time interval of 1.5s?

## Homework Equations

Power=work done/time interval (in Newton meters per second or Watts)

Work=Fd (in Newton meters or Joules)

## The Attempt at a Solution

Power = Fd/t = (m)(a)(d)/t = 50kg(9.8 m/s2)(1.2m)/1.5s = 392 Nm/s = 392 W

This is how I solved the problem, but my professor said the correct answer is 40 Watts!

Work = force x distance; work = 50 kg x 1.2 m, work = 60

Power = work /time; 60/1.5 = 40 Watt

Can someone please verify which way is correct? I am sticking by my answer of 392 Watts