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What is the principle of wearing cocktail rubber bands in slingshots?

In fact, the principle of internal reference and cocktail is not complicated. When the rubber band is unfolded, the heavier rubber band in the front section is recovered first, which drives the steel O in the rubber bag to take the first step, and then the lighter rubber band in the back section is recovered and restored to its original state, thus generating a second force and forming a speed superposition, so the output speed is much faster than that of the general rubber band group, and the trajectory has to go further.