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Conservation of momentum

  1. Oct 21, 2007 #1
    A 9700 kg boxcar traveling at 18 m/s strikes a stationary second car. The two stick together and move off with a speed of 8.0 m/s. What is the mass of the second car?
  2. jcsd
  3. Oct 21, 2007 #2
    its a homework question, to be posted in the homework forum.

    and think about it.
    total momentum is conserved. You might try adding two masses together.
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