When an object is thrown horizontally with a certain initial velocity, if the object is only affected by gravity, such motion is called horizontal motion. Horizontal motion can be regarded as the combined motion of uniform linear motion in the horizontal direction and free fall motion in the vertical direction. For an object in horizontal motion, since the combined external force it is subjected to is a constant force, the horizontal motion is a uniformly accelerated curvilinear motion, and the motion trajectory of the horizontal object is a parabola. The horizontal motion is a curvilinear motion. The time of horizontal motion is only related to the vertical height of the throwing point; the horizontal displacement of the object when it lands is related to the time (vertical height) and the horizontal initial velocity.

Horizontal displacement of projectile motion: Δx = V_x0t

Δx = horizontal displacement

V_x0 = Initial velocity

t = time