Question 3
A and B carry identical loads up the same staircase. A takes 10 seconds and B takes 20 seconds. Which statement is true?
The right answer is the one marked above.
A and B do the same work, but A has the greater power. The load and the height are the same, so the work is the same. A did it in half the time, so A’s rate of doing work is twice B’s.
This is the whole distinction the section rests on. Work asks how much was achieved; power asks how quickly.