When a spring is stretched by 10cm, the potential energy is stored is E. When the spring is stretched by 10cm more, the potential energy stored in the spring becomes
Correct answer: B. 4E
- A. 2E
- B. 4E
- C. 6E
- D. 10E
Explanation
E = ½ kx2 E= ½ k(0.1)2 For second situation, E'= ½ kx'2 E'= ½ k(0.2)2 Comparing E and E', we get E'= 4E
This question appeared on the NUMS 2014 paper, which you can sit online with every answer explained.
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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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