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Projectile motion is a form of motion in which an object or particle (called a projectile) is thrown near the earth's surface, and it moves along a curved path under the action of gravity only. The only force of significance that acts on the object is gravity, which acts downward to cause a downward acceleration.
Projectile is the name given to a body thrown with some initial velocity with horizontal direction and then allowed to move in 2 dimensions under the action of gravity alone without being propelled by any engine or fuel.The path followed by the projectile is trajectory