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## Homework Statement

A 150kg cart moving at 13m/s east collided with a 420kg wagon moving at 5m/s east.The cart rebounded westward with a speed of 3m/s. What was the speed of the wagon after the collision?

## Homework Equations

m1v1+m2v2=m'1v'1+m'2v'2

## The Attempt at a Solution

I solved the problem with this formula but i got 8.57m/s as the answer but the correct answer should be 11m/s.