Exam-style question
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An object falls freely from rest and reaches a speed of 15 m/s after 3 seconds. Calculate the acceleration due to gravity.
- A.5 m/s²
- B.10 m/s²
- C.15 m/s²
- D.20 m/s²
Model answer
What a good answer should say
- 5 m/s².
- the correct option
Explanation
Why this works
The correct answer is 5 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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