Two hard steel balls collide in a perfectly elastic collision. The first ball has a mass of 1kg and is traveling at 5m/s east. The second ball has a mass of 2kg and is initially traveling at 7 m/s west along the same path so they collide head on. After the collision the second ball is traveling at 1m/s east. What is the velocity of the 1st ball after the collision?
**How do I solve and show the work for this? :/ Thanks!!

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the situation, before collision is:
|dw:1433610623171:dw|

ok!

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