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Conservation of linear momentum!

  • Thread starter jahlin
  • Start date
  • #1
21
0

Homework Statement



Two cars 1 and 2 moving against each other collides.There are no external forces acting on them.

Homework Equations



conservation of linear momentum:
m1*v1+m2*v2 =(m1+m2)v12


The Attempt at a Solution


I have solved the problem but my question is how come they have a common speed after the collision?I dont understand this part can someone clarify it please.
 

Answers and Replies

  • #2
537
2
The equation you wrote is the one used when the two objects stick together when they collide, so after the collision there is only one object with a mass of m1+m2. This is called a perfectly inelastic collision. You can't use that equation if the objects bounce off each other.
 
  • #3
21
0
thanks a bunch mikelepore!
 

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