- #1

maccha

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## Homework Statement

A climber's gravitational potential energy increases from 14000 J to 21 000 J while climbing a cliff. She expends 18 000 J of energy during this activity. What is the efficiency of this process?

## Homework Equations

Efficiency= useful output/ total input

Total energy before = total energy after

## The Attempt at a Solution

Well, I've been able to solve all other efficiency/ conservatino of energy questions but for some reason I just don't understand this one. I don't understand what to consider as the input or the useful output energy. Thanks for your help!