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