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Keeping in mind Newton's First Law of Motion, if a rock is thrown it should stay in motion at a constant velocity. Why doesn't it

Keeping in mind Newton's First Law of Motion, if a rock is thrown it should stay in motion at a constant velocity. Why doesn't it do that? A. Momentum acts as a force to change its behavior. B. You didn't throw it hard enough. C. Gravity acts as a force to change its behavior. D. It needs an external force and an internal force to stay in motion

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