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Homework Help: Conservation of momentum of a boxcar

  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?


    is 21825 m/s the answer? sig figs?
  2. jcsd
  3. Oct 21, 2007 #2
    its asking for mass...
  4. Oct 21, 2007 #3
    Ok, so this is an example of completely inelastic collision- that means that the 2 bodies will have the same final velocity. Use the formula for the final velocity, and find the mass of the car. Did that help?
  5. Oct 21, 2007 #4

    P = momentum, m=mass, v=velocity...
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