(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

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

2. Relevant equations

conservation of linear momentum:

m1*v1+m2*v2 =(m1+m2)v12

3. 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.

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# Homework Help: Conservation of linear momentum!

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