Exam-style question
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A spring has a spring constant of 100 N/m and is extended by 0.6 m. What is the elastic potential energy stored in the spring?.
- A.18 J
- B.30 J
- C.36 J
- D.60 J
Model answer
What a good answer should say
- 18 J
Explanation
Why this works
Using the formula Ee = 0.5 x k x e^2, we substitute the values: Ee = 0.5 x 100 N/m x (0.6 m)^2 = 18 J. Thus, the correct answer is 18 J.
Common mistake
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