1. The problem statement, all variables and given/known data Determine the time it takes to climb three flights of stairs (height = 9.7m). Compute the work done against gravity. Compute the average power expended in watts and in horsepower. Person = 150lbs. 2. Relevant equations h = 9.7m 4.45N/1lb Avg Power = change in W/change in t 1hp = 746W F=ma W = F * d 3. The attempt at a solution Ok...so, my 150lb=667.5N. That's my F now. W = f * d = 667.5N * 9.7m = 6474.75J Once I can find the time it took, then I can use that and the work to find the average power. I just can't figure out how to get time traveled from Work done. Am I on the right track?