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scientificphilosopher: Momentum conservation and Newton’s first law (inertia). [x]
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![scientificphilosopher: Momentum conservation and Newton’s first law (inertia). [x]](https://64.media.tumblr.com/219a022d376c841564471934166c0470/tumblr_o8xwqm20EZ1sstavyo1_500.gif)