The displacement is zero, but work was done on the book.
Though the book was put back in the same spot, work involves the application of force over a distance. When you take the book off the shelf, you exerted a force to lift it. Therefore, work was done on the book even though the displacement is zero.
4.
You take a book off a shelf, look at it, and then put it back in the exact same spot. What is the displacement of the book, and how much work have you done on the book?
The displacement is zero, and no work was done on the book.
The displacement is zero, but work was done on the book.
The displacement is not zero, and work was done on the book.
The displacement is not zero, but no work was done on the book.
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