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## 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.