Mathematics
OpenStudy (anonymous):

An electric scooter has a battery capable of supplying 120 Wh of energy. If friction forces and other losses account for 60.0% of the energy usage, what altitude change can a rider achieve when driving in hilly terrain, if the rider and scooter have a combined weight of 890 N? @Physics

OpenStudy (anonymous):

$Energy\ in\ battery\ =120\ W.hr$$=120\times3600\ W.s$$Energy\ in\ battery\ =4.32\times 10^5\ J$ $Work\ supplied\ by\ battery\ =\ 60\%\ of\ Energy\ in\ battery$$=0.6\times 4.32\times10^5$$=2.592\times10^5\ J$ $Energy\ gained\ by\ object\ =\ Work\ supplied\ by\ battery$$Also,\ Energy\ gained\ by\ object\ =\ m.g.h$$\implies(890\ N)\times h=2.592\times10^5\ J$$h=2.91236\times 10^2\ m$

OpenStudy (anonymous):

says the answer is wrong =( but it says its within 10% of the correct answer!