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## Homework Statement

Joe ascends a small hill from an elevation of 250m to an elevation of 490m. In doing so he expends 2.8x10^5J. If Joe's mass is 75kg what is the efficiency of his climb?

## Homework Equations

W= change in E= change in Ek + change in Ep

Ep= mgh

Ek= 0.5mv^2

%efficiency=useful energy output/total energy input x 100%

## The Attempt at a Solution

should i use the work energy theorem to solve the problem?