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i'm not a physics prof, but i thought that if an object in motion was not encountering any contrary action, then the motion would continue as it is. including a state of acceleration.
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Accelleration cannot occur in the absence of an outside force. The absence of resistance is not sufficient to create accelleration and would, in fact, violate Newton's 2nd law (inertia: objects at rest/motion tend to stay that way- motion being constant velocity in this case).