Exam-style question
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A weightlifter lifts a 150 kg weight to a height of 2 meters. What is the gravitational potential energy gained by the weight?.
- A.3,000 J
- B.2,940 J
- C.1,470 J
- D.1,500 J
Model answer
What a good answer should say
- 2,940 J
Explanation
Why this works
Gravitational potential energy is calculated using the formula: Ep = m x g x h. Assuming g = 9.8 N/kg, substituting the values: Ep = 150 kg x 9.8 N/kg x 2 m = 2,940 J.
This indicates the energy gained by the weight due to its height.
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