Posted by **Michelle** on Friday, April 25, 2014 at 12:22pm.

In one dimension, a 5g ball is moving to the right at 7 m/s collides with an 8g ball moving to the left at 4 m/s for a perfectly elastic collision. What is the final velocity of both balls?

I just don't understand the whole left and right thing. I have already worked it out I just want to know if I am doing it right! Thanks!

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