AP Physics 1 Question 77: Answer and Explanation
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The graph above shows the velocities of two objects undergoing a head-on collision. Given that Object 1 has 4 times the mass of Object 2, which type of collision is it?
- A. Perfectly elastic
- B. Perfectly inelastic
- C. Inelastic
- D. Cannot be determined
Correct Answer: A
A First, perfectly inelastic can be immediately eliminated because the objects have different velocities after the collision. Next, recall that a collision is perfectly elastic if kinetic energy is conserved.
Because kinetic energy was conserved, the collision must be perfectly elastic.