If all of the balls were perfect and racked perfectly, how would the balls move after a perfect break?
Here is an interesting analysis and simulation showing the results of a perfect break with perfect balls by Jim Belk of Bard College. Here is one of the results, assuming everything is perfect, with elastic (Hertzian) compression of the balls:
Here’s an example of a very symmetrical 10-ball break pocketing both 2nd-row balls in the sides:
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