Question

using a lever a person applies 60 n of force and moves the lever 1 m this moves a 200 newton rock at the other end by 0.2 m

Answer 1

work output = 40 N*m

Work input = 60 N*m

Efficiency = 66.67%

Explanation:

I did this on a paper so Im sorry but it's to complicated to explain the work proof on the computer. I dont want to type all that equation stuff but thats the answer.