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14 November, 00:05

A railroad car with a mass of 30,000 kg is moving at 2.0 m/s when it runs into an at-rest freight car with an equal mass. the cara lock together. what is their final velocity?

A. 2.0 m/s

B. 0.5 m/s

C. 60,000 kg-m/s

D. 1.0 m/s

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Answers (1)
  1. 14 November, 01:46
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    D. It is the same energy but now pushing twice as much, so it would be half as fast so 1 m/s
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