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In this lesson, you will learn what the equations of projectile motion are and how to use them in physics. Projectile motion refers to an object moving in two dimensions (vertically and horizontally) under the effect of a gravitational force. Projectile covers the motion of balls and rockets flying in space or in the atmosphere, as well as the motion of a thrown rock or other object. The equations of projectile motion allow is to predict the position and velocity of an object at an point in the future along its trajectory after the motion begins..