The gravitational potential energy gained by a 2 kg mass lifted through 5 m, taking g as 10 m s-2, is
Correct answer: C. 100 J
- A. 10 J
- B. 25 J
- C. 100 J
- D. 1000 J
Explanation
Potential energy gained is mgh, which is 2 times 10 times 5, giving 100 J. The route taken to lift the mass makes no difference, since gravity is a conservative force and only the change in height counts. The answer 10 J comes from omitting the height.
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About Potential Energy
Potential energy is energy stored because of position or configuration, including gravitational potential energy near Earth's surface and elastic energy in a stretched or compressed spring. Questions use changes in potential energy and conservation of mechanical energy, while distinguishing a chosen reference level from an absolute zero of energy.
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