Exam-style question
Try this first
A ball is thrown downwards with an initial speed of 10 m/s from a height of 15 m. Calculate the time it takes to hit the ground.
- A.2 s
- B.3 s
- C.4 s
- D.5 s
Model answer
What a good answer should say
- 3 s.
- the correct option
Explanation
Why this works
The correct answer is 3 s. 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
No common mistake is linked to this question yet.