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A projectile will move in a way that is typical of an object upon which the only force is gravity. Using a knowledge of physics principles from previous units allows one to make some conclusions about how projectile motion can be described. Since the only force on a projectile is gravity, there is an unbalanced force which causes the object to accelerate. Since the unbalanced or net force is downward, a projectile will accelerate downward. The direction that it moves is irrelevant since forces only determine the direction of the acceleration, not the direction of the motion. Being that a projectile is accelerating, one can conclude that it is changing its velocity.
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