You run up a flight of stairs, and then you walk up a second, identical, flight of stairs. Compared with running up the first flight of stairs, in walking up the second flight your

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Power is the rate of doing work. When you walk up the stairs, you take more time compared to running, so your power output is smaller, even though the work done (lifting your body to the same height) is the same.

You Run Up a Flight of Stairs, and Then You