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Learn about the physics of projectile motion , the path and velocity of an object launched into the air under gravity alone. Find equations, examples, applications and history of this topic. A projectile is an object upon which the only force is gravity. Once projected, its horizontal motion is explained by the law of inertia and its vertical motion is explained by the presence of gravity as an unbalanced, vertical force. Learn what is projectile motion , how to calculate its time of flight, range, maximum height and equation of trajectory. Explore real-life examples of projectile motion in sports and everyday life. Projectile motion refers to the curved path an object follows when it is thrown or projected into the air and moves under the influence of gravity. In this motion , the object experiences two independent motions: horizontal motion (along the x-axis) and vertical motion (along the y-axis).