Suppose a moving railroad car collides with an identical stationary railroad car and the two cars latch together. Ignoring friction, and assuming no deformation on impact, which of the following statements is true?

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The Praxis General Science: Content Knowledge (5435) exam is a test required by many states for credential candidates planning to teach science at a high school level. It is a single, computer-delivered test that includes questions from five content domains.

The content categories are Scientific Methodology, Techniques, and History; Physical Science; Life Science; Earth and Space Science; and Science, Technology, and Society.


Suppose a moving railroad car collides with an identical stationary railroad car and the two cars latch together. Ignoring friction, and assuming no deformation on impact, which of the following statements is true?