Velocity describes the speed of an object in a specific direction.____ Displacement is the change in an object's position from its starting point. ____ Acceleration is the rate at which velocity changes over time. ____ An object in uniform motion moves at a constant speed. ____ Free fall occurs when the only force acting on an object is gravity. ____ Instantaneous speed is the speed of an object at a specific moment in time. ____ The slope of a velocity–time graph represents an object's acceleration. ____ In projectile motion, horizontal velocity stays constant if air resistance is ignored. ____ The area under a velocity–time graph gives the displacement of an object. ____ A horizontal line on a velocity–time graph means the velocity ____

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