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rgroom1 says...

the center of mass of the spring falls at about normal speed, it just moves relative to the bottom as the spring compresses. There is probably some effect from the stored energy too.

my prediction for the tennis ball experiment: the bottom will behave similarly but for a shorter time since the center of mass is closer to the bottom because of the ball. the stored energy effect will be greater because it is stretched more.

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rgroom1 says...

It looked like some sort of tidal pool, the biggest one i've seen. The sand will fill in eventually, and there will be plenty of smaller tidal pools for nature to live in.

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