Item RG099002: After one car bumps into another car, the first car moves slower and second car moves faster because energy was transferred from the first car to the second..

A child is playing with toy cars. Both cars are moving along a track. Car A and Car B are both moving in the same direction. Car B is moving slower than Car A, and Car A bumps into the back of Car B.

Which of the following correctly describes Car A’s and Car B’s speeds after the bump and why? 

  1. After the bump, Car A is moving slower and Car B is moving faster because energy was transferred from Car A to Car B.
  2. After the bump, Car A and Car B are both moving slower because some energy was destroyed when Car A hit Car B.
  3. After the bump, Car A and Car B are both moving faster because the cars create energy as they move.
  4. After the bump, Car A and Car B are both moving at the same speed because no energy was transferred when Car A hit Car B.

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