A student holds her (1.5-mathrm{kg}) psychology textbook out a second story dormitory window until her arm is

Question:

A student holds her \(1.5-\mathrm{kg}\) psychology textbook out a second story dormitory window until her arm is tired; then she releases it \(\square\) Figure 5.4). (a) How much work is done on the book by the student by simply holding it out the window? (b) How much work is done by the force of gravity during the time in which the book falls \(3.0 \mathrm{~m}\)?
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THINKING IT THROUGH. Analyze the situations in terms of the definition of work, keeping in mind that force and displacement are the key factors.