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A projectile flying through the air is subject to both the force of gravity and the force of air resistance. a) Which of these forces

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A projectile flying through the air is subject to both the force of gravity and the force of air resistance. a) Which of these forces does work? If they do work, is it always positive, always negative, or does the sign vary? b) Only one of these two forces has a potential energy associated with it. Which is it, and why

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