AP Physics 1 Question 440: Answer and Explanation

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Question: 440

8. A student pushes a 6 kg box up an inclined plane with a height of 10 m. How much work does gravity do on the box during this process?

  • A. -1,200 J
  • B. -600 J
  • C. 600 J
  • D. 1,200 J

Correct Answer: B

Explanation:

B

As gravity is a conservative force, the work done by gravity is path independent and can be calculated as

ΔUg = -Wg ⇒ Wg = -ΔUg = -mg(hf - hi) = -6 kg(10 m/s2)(10 m - 0 m) = -600 J