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no sound ;-(

Hi gellander97, thanks for the comment. The sound plays fine on this end, so just let me know if that happens again.

All the best,
Mr. Dychko

On this problem, the equation for elastic collisions is vA - vB = v'A - v'B, but why is the one on #25 negative for the final velocity (v') side?

Wait! Nevermind - got it.