Exam-style question
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A ball is dropped from a height of 20 meters. Calculate the gravitational potential energy of the ball just before it is dropped. Use g = 9.81 N/kg.
Model answer
What a good answer should say
- The gravitational potential energy of the ball is 196.2 J.
Explanation
Why this works
This question tests the understanding of gravitational potential energy and its calculation using the formula Ep = m x g x h. The substitution of mass (m = 2 kg), gravitational field strength (g = 9.81 N/kg), and height (h = 20 m) leads to the calculation of potential energy.
Common mistake
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