Exam-style question
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A spring with a spring constant of 80 N/m is compressed by 0.5 m. What is the elastic potential energy stored in the spring?.
- A.10 J
- B.12 J
- C.20 J
- D.25 J
Model answer
What a good answer should say
- 10 J
Explanation
Why this works
The elastic potential energy can be calculated using the formula Ee = 0.5 x k x e^2. Substituting the values gives Ee = 0.5 x 80 N/m x (0.5 m)^2 = 10 J.
Therefore, the correct answer is 10 J.
Common mistake
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