AP Physics 1 Question 214: Answer and Explanation
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4. While a person lifts a book of mass 2 kg from the floor to a tabletop, 1.5 m above the floor, how much work does the gravitational force do on the book?
- A. -30 J
- B. -15 J
- C. 0 J
- D. 15 J
Correct Answer: A
The gravitational force points downward while the book's displacement is upward. Therefore, the work done by gravity is -mgh = -(2 kg)(10 N/kg)(1.5 m) = -30 J.