Exam-style question
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A pendulum swings from its highest point (maximum potential energy) to its lowest point (maximum kinetic energy). If the maximum height is 1.5 m, calculate the potential energy at the highest point for a mass of 2 kg.
- A.29.4 J
- B.19.6 J
- C.9.8 J
- D.39.2 J
Model answer
What a good answer should say
- 29.4 J
Explanation
Why this works
The potential energy (Ep) at the highest point is calculated using the formula Ep = m x g x h. Substituting the values: Ep = 2 kg x 9.81 N/kg x 1.5 m = 29.4 J.
Therefore, the potential energy at the highest point is 29.4 J.
Common mistake
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