If you walk up a flight of stairs at constant speed,
Chapter 10, Problem 22MCQ(choose chapter or problem)
Problem 22CQ
If you walk up a flight of stairs at constant speed, gaining vertical height h, the work done on you (the system, of mass m) is
A. +mgh, by the normal force of the stairs,
B. − mgh, by the normal force of the stairs,
C. +mgh, by the gravitational force of the earth.
D. −mgh, by the gravitational force of the earth.
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