A Horizontal throw motion is called a horizontal throw motion when an object is thrown along a square of water at a certain initial speed and is acted upon only by gravity. The Horizontal throw motion can be regarded as the uniform straight line motion of water square and the combined motion of a free-falling body in the vertical direction. Horizontal throw motion object, because the combined force is constant force, so the Horizontal throw motion is a uniform variable curve motion, the trajectory of the flat throw object is a parabola. Horizontal throw motion time depends only on the vertical height of the point; The level displacement and time (vertical height) and the level start speed of the object are related.

Horizontal throw motion level displacement ：Δx = V_x0t

Δx = level displacement

V_x0 = Inception speed

t = time