The last question is how one person can "double bounce" another person by landing slightly before them. The first person to hit the trampoline stretches the spring, storing potential energy, and then when the second person impacts the trampoline, the already stretched material stretches a bit more, and most of the total potential energy is transferred to the second person. The first person does not receive much of the potential energy because they are essentially waiting for the potential energy to spring them upwards, but then the second person concentrates the energy under their impact, propelling them upward while the first person barely moves.
Warning: If you don't have a net around your trampoline (like my old one), be careful about double bouncing because it is easier for somebody to land outside of the trampoline on the ground. Don't ask me how I know.
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