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Momentum and when V' is Zero

  • Thread starter mike_302
  • Start date
  • #1
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Homework Statement



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?


Homework Equations


P(total)=P'(total)


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
 

Answers and Replies

  • #2
dx
Homework Helper
Gold Member
2,011
18
There's no special indicator in this case other than the momentum conservation calculation.
 

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