Question: If you drop a book from a certain height, it falls (accelerating all the while) because of the gravitational force exerted by Earth on it.

If you drop a book from a certain height, it falls (accelerating all the while) because of the gravitational force exerted by Earth on it. Because forces always come in interaction pairs, the book must exert a force on Earth.

(a) How does the magnitude of \(F_{\text {by book on Earth }}\) compare with the magnitude of \(F_{\text {by Earth on book }}\) ?

(b) Is Earth accelerating during the interaction? Why or why not?

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