A molecule of mass 89.3 atomic mass units moving at 0.80 km/s to the right, and another molecule of mass 18.0 atomic mass units moving at 0.40 km/s to the left, collide.  The second molecule has a velocity of 0.60 km/s to the right after the collision.  What is the velocity of the first molecule in km/s after the collision?

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A: thank you

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