Exam-style question
Try this first
A 2 kg object moving at 3 m/s collides with a stationary 1 kg object. If the collision is perfectly elastic, what is the final velocity of the 1 kg object?.
- A.1 m/s
- B.2 m/s
- C.3 m/s
- D.4 m/s
Model answer
What a good answer should say
- 2 m/s.
- the correct option
Explanation
Why this works
The correct answer is 2 m/s. This supports Apply conservation of momentum to collisions and explosions.
in Momentum 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.