1. The problem statement, all variables and given/known data How much mechanical energy is needed for avg size person to climb climb up nine flights of stairs? 2. Relevant equations E=KE+PE PE=mgh KE=1/2mv^2 3. The attempt at a solution person is about 80kg g=9.8ms^-2 h is about 3 meters per floor for 10 floors = 30m so at top, when the person stops climbing there is only PE so E=0+80*9.8*30=23520J isn't this only like 4 kcals? doesn't that seem low?