In the example of trampoline to explain the gravity,

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送交者: cornbug 于 2016-04-03, 23:43:05:

回答: 这个 由 短江学者 于 2016-04-03, 23:21:42:

what on earth a particle has to fall down along the curve that is banded? The particle can go either up or down a curve or even not move at all, not necessarily just goes downward.

Rubbish.



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