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## Homework Statement

A 150 kg cart moving at 13 m/s east collided with a 420 kg wagon moving at 5.0 m/s east.

The cart rebounded westward with a speed of 3.0 m/s . What was the speed of the wagon after the collision? Observe standard Cartesian coordinates.

## Homework Equations

KE1+KE2=KE1'+KE2'

conservation of momentum

conservation of kinetic energy in elastic collisions

## The Attempt at a Solution

(0.5)(150)(13)

^{2}+(0.5)(420)(5)

^{2}=(0.5)(150)(-3)

^{2}+(0.5)(420)v

^{2}

v=9.0m/s

Answer as given is 11m/s

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