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## Homework Statement

a 480kg car moving at 14.4m/s hits a another car from behind moving at 13.4m/s in the same direction. if the second car has a mass of 570kg and a new speed of 17.9m/s what is the velocity of the first car after the collision??

## Homework Equations

m1*v1=m2*v2

doubt that's it

## The Attempt at a Solution

i know its 8.94m/s but why??