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A 6.0-kg block moving at 9.0 m/s to the right collides head-on with another 12.0-kg block...

A 6.0-kg block moving at 9.0 m/s to the right collides head-on with another 12.0-kg block moving at 3.0 m/s to the left. What are the velocities of the two blocks after the collision if the collision is elastic?
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