# physics

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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)

• physics -

I will be happy to critique your work.

• physics -

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

• physics -

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

watch units.

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