AP Physics 1 Question 432: Answer and Explanation
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10. A worker moves a 30 kg box by pulling on it with a rope that makes a 60° angle with the horizontal. If the worker applies a force of 40 N and pulls the box over a distance of 20 m, how much work did the worker do?
- A. 100 J
- B. 200 J
- C. 400 J
- D. 800 J
Correct Answer: C
The work done can be calculated as follows:
W = Fd cosθ = 40 N · 20 m · cos60° = 400 J