a 715 N person walks up three flights of stairs, covering a total vertical distance of 10.5 m. (a) If, as is 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? (1 food calorie=4186J)

Answer 1

I will be happy to critique your work.

Answer 2

Thanks, I am unsure of how to start the problem though.

Answer 3

work=mass*g(height)
energy in= work/.2= ...

watch units.