The horizontal distance travelled by the ball directly depend on horizontal velocity.
The horizontal displacement is directly depend upon both the time of flight and the horizontal velocity (vox). For the same launch speeds, the projectile with the greatest angle of launch will have the greatest time of flight, but its horizontal velocity is too small which leads smaller horizontal displacement.
While on the other hand, if the projectile with the shortest angle of launch will have the smaller time of flight in the air, but has larger horizontal velocity which results in the larger horizontal displacement that is covered by the body so we can conclude that the horizontal distance travelled by the ball directly depend on horizontal velocity.
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