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How do you find the initial speed?

  1. Oct 12, 2009 #1
    2586 kg van runs into the back of a 824 kg compact car at rest. They move off together at 8.5 m/s. Assuming the friction with the road can be negligible, find the initial speed of the van.

    i dont even know where to start :/
     
  2. jcsd
  3. Oct 12, 2009 #2

    rock.freak667

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    Since they are colliding, what quantity do you know is conserved in collisions?
     
  4. Oct 12, 2009 #3
    umm i dont know?
     
  5. Oct 12, 2009 #4

    rock.freak667

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    Do you know anything about what mass*velocity gives?
     
  6. Oct 12, 2009 #5
    yea it gives momentum
     
  7. Oct 13, 2009 #6

    rock.freak667

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    So in a collision, is momentum conserved or not?
     
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