Collision of two initially moving objects

vendredi 11 juillet 2014

So I know how to solve for two initially moving objects that collide one way, but I was reading on this website another way to do it and I am not understanding a step. I've included a picture of the site and underlined the step I don't understand. I've tried a couple ways but I can't get it.



Here is the link the the site as well



http://ift.tt/1oPuGA2



Thanks for reading.




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