AP Physics 1 Question 394: Answer and Explanation
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2. A 2 kg ball traveling at 25 m/s collides head on with a 1 kg ball traveling at 20 m/s. After impact, both objects reverse direction with the 2 kg ball traveling at 2.5 m/s and the 1 kg ball traveling at 35 m/s. What type of collision occurred?
- A. Inelastic
- B. Perfectly inelastic
- C. Elastic
- D. Cannot be determined
Correct Answer: A
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 not conserved, the collision is inelastic.