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rcgldr
#6
Dec21-12, 12:44 PM
HW Helper
P: 7,107
Conservation of momentum and energy don't limit the result to just one possible outcome. For example, the released balls could end up bouncing backwards a bit and momentum and energy will be conserved. In the real world, a single released ball will bounce backwards at a small velocity (slight rebound). Link to a web site with the details:

cradle.htm