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Momentum and when V' is Zero

  1. May 6, 2009 #1
    1. The problem statement, all variables and given/known data

    Two balls roll directly towards eachother. The 0.25kg ball has a speed of 1.7m/s. The 0.18kg ball has speed of 2.5m/s. After the collision, the 0.25kg ball has reversed its direction and has a speed of 0.10m/s . What is the magnitude and direction of the 0.18 kg ball after hte collision?


    2. Relevant equations
    P(total)=P'(total)


    3. The attempt at a solution

    I know the answer.... IT's 0 m/s . Further question though:

    On a test, I'd be questioning that result. As I did when I first obtained it in the homework... So I thought to myself: Zero tends not to just come out of nowhere... There's usuall an indicator that it's coming. What is the indicator that one of the objects in a collision will stop? Is there any sort of indicator in this case?

    Thanks!

    Mike
     
  2. jcsd
  3. May 6, 2009 #2

    dx

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    Gold Member

    There's no special indicator in this case other than the momentum conservation calculation.
     
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