A body of mass 2 kg is raised 5 m. Taking g as 10 m per second squared, the potential energy gained is
Correct answer: C. 100 J
- A. 10 J
- B. 50 J
- C. 100 J
- D. 25 J
Explanation
Using mgh, the energy is 2 multiplied by 10 multiplied by 5, giving 100 J. If the body were then dropped, all of it would convert to kinetic energy just before impact, giving a landing speed of 10 m per second. Forgetting to include g gives the 10 J distractor.
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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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