Exam-style question
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A ball is dropped from a height of 20 m. Calculate the acceleration due to gravity using the formula for gravitational potential energy.
- A.9.81 m/s²
- B.10 m/s²
- C.8.5 m/s²
- D.9.0 m/s²
Model answer
What a good answer should say
- 9.81 m/s².
- the correct option
Explanation
Why this works
The correct answer is 9.81 m/s². This supports Calculate acceleration due to gravity from motion data.
in Motion along a straight line because it uses the required mechanics relationship directly. The other options are less suitable because they confuse a different force, motion, energy, momentum, or materials concept.
Common mistake
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