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The issue is mass versus drag. If there were no air resistance, then the balls would all bounce the same. The extra mass of the air filled ball means the ball starts with more energy. It loses the same energy due to rebound and air resistance as it falls, it then will be able to rebound to a higher level.
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James
The pessimist complains about the wind; the optimist expects it to change; the engineer adjusts the sails.- William Arthur Ward (1921-1994)
Red-beard for President, 2020
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