Exam-style question
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If a spring with a spring constant of 250 N/m is stretched by 0.4 m, what is the elastic potential energy stored in the spring?.
- A.20 J
- B.40 J
- C.50 J
- D.80 J
Model answer
What a good answer should say
- 20 J.
- the correct option
Explanation
Why this works
The correct answer is 20 J. This supports Calculate elastic potential energy from spring extension.
in Bulk properties of solids because it uses the required mechanics relationship directly. The other options are less suitable because they confuse a different force, motion, energy, momentum, or materials concept.
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