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Nothing especially new with this bouncing balls example as it's essentially a rehash - using p5.js - of something I did years ago in Processing that's now buried on openProcessing. That was itself largely code ported from the excellent resource (still) ActionScript Animation.
I need to update the demo page with a link to the source which includes a readme with a bit more background info; and I still need to do another bug-swatting/optimisation sweep...
You can have some fun fiddling with the balls [lame euphemism :\"> ]... and independent controls. Balls can be clicked, dragged and thrown...