11. Choose the FALSE statement regarding motion and rest: A. We say that a body is mobile, i.e. it is in motion, if it constantly changes its position in relation to other bodies considered "fixed". B. We say that a body is at rest if its position relative to other bodies, considered "fixed", does not change over time. C. Mechanical movement and rest are relative because in nature we cannot find fixed bodies. D. Reference systems at rest or in rectilinear and uniform motion are called inertial. E. Reference systems in accelerated rectilinear motion are also called inertial .

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