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Biology, 10.10.2019 13:10, payshencec21
When pushing a child on a swing, you must give them a push periodically to keep them moving. this seems to go against the law of inertia and the conservation of energy. why does the child need a push periodically to keep moving.
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When pushing a child on a swing, you must give them a push periodically to keep them moving. this se...
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