Kelly carried a box weighing 10 N for 200 meters from his car to his new house. George then took the box from Kelly and carried it up a 3-meter tall flight of stairs. Who did more work?

While moving box from car to house W = F * d * cosine (90 degree) = 10N * 200m * 0 = 0Nm
While lifing 3m tall flight of stairs W=F d cosine(0 degree) = 10N * 3m = 300 Nm
George did more work

Answered by Pulkit | 2024-06-10

I think George did more work because George moved the box to the same direction as the force that he applied. So he is applying an upward force to the box to keep it from falling down and moving to the box up the stairs and Kelly does move the box farther than George, but he isn´t doing any work before the force he applies to the box on a different direction than movement.
Hope this helps
Tobey

Answered by TobeySnaps | 2024-06-11

Kelly did more work than George. Kelly performed 2000 J of work by carrying the box 200 meters, while George performed 30 J of work by lifting it 3 meters. Hence, Kelly's activity required more energy despite the common perception of lifting being harder.
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Answered by Pulkit | 2024-12-26