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Jan 23, 2013 · Convert masses to kg before any calculations! 1$ bill ~ 10-3 kg, butter or apple ~ 10-1 kg, student ~ 50 kg. 31. Newton’s 1st: No net force needed for motion. Otherwise known as the Law of Inertia: “An object at rest tends to stay at rest, and an object in motion tends to stay in motion.” ................
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