Coefficient of restitution!!!
Also known as squishyness!!! The rubber ball squashes and then expands which aborbs energy adn releases it slowly. In comparison the marble cannot compress so energy transfer is instantaeneous, hence more energy at a iven time being used, hence more bounces.
This only works where there is no give int he surface they are being dropped on and assuming no external forces (friction, air pressure....)
Q. Greatest non-meat love song??
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