posted by Anonymous .
A 715N person walks up three flights of stairs, covering a total vertical distance of 10.5(a)If as typical, only 20% of the caloric (food) energy is converted to work by the muscles, how many joules and food calories of energy did the person use
The answer is Five times the potential energy increase.
I assume the 10.5 is in meters. You need to include the units.
The number you end up with will be in Joules. That will need to be converted to (food) Calories.
1 food Calorie = 1000 calories = 4184 Joules.