AP Physics 1 Question 227: Answer and Explanation

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Question: 227

8. Two frictionless carts (mass = 500 g each) are sitting at rest on a perfectly level table. The teacher taps the release so that one cart pushes off the other. If one of the carts has a speed of 2 m/s, then what is the final momentum of the system (in kg · m/s)?

  • A. 2,000
  • B. 1,000
  • C. 2
  • D. 0

Correct Answer: D



Because the two carts are initially at rest, the initial momentum is zero. Therefore, the final total momentum must be zero.