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8 November, 03:35

A 20 kg rock is perched atop a cliff that is 100 m high. What is its potential

energy?

A. 200,000 J

B. 0.20

C. 2,000 u

D. 19,600 J

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Answers (1)
  1. 8 November, 06:15
    0
    D. 19,600 J

    Explanation:

    The formula for potential energy (PE) is PE = mgh, with m standing for mass, g for acceleration due to gravity, and h for height. The acceleration due to gravity on earth is constant, 9.8 meters per second squared. Substituting the formula would give PE = (20) (9.8) (100) / PE = 19,600 J.
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