AP Physics 1 Question 441: Answer and Explanation
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9. A 2 kg ball traveling to the right at 6 m/s collides head on with a 1 kg ball at rest. After impact, the 2 kg ball is traveling to the right at 2 m/s and the 1 kg ball is traveling to the right at 8 m/s. What type of collision occurred?
- A. Inelastic
- B. Perfectly inelastic
- C. Elastic
- D. Cannot be determined
Correct Answer: C
The objects did not stick together after the collision, so (B) is wrong. To determine whether the collision is elastic or inelastic, calculate the total initial and final kinetic energies:
As kinetic energy was conserved, the collision was elastic.