the object is thrown in the horizontal direction with a certain initial velocity. if the object is only affected by gravity, such a motion is called a horizontal throw motion. the flat throwing motion can be regarded as the combined motion of uniform linear motion in the horizontal direction and free fall motion in the vertical direction. since the net external force on an object in horizontal motion is a constant force, the motion of an object in horizontal motion is a uniform variable speed curve motion, and the trajectory of a horizontally thrown object is a parabola. the horizontal throwing motion is a curved motion. the time of the flat throwing motion is only related to the vertical height of the throwing point; the horizontal displacement of the object landing is related to time (vertical height) and horizontal initial velocity.

horizontal displacement of flat throwing motion: δx = v_x0t

δx = horizontal displacement

V_x0 = initial speed

t = time