1. Air Resistance: The primary factor affecting the horizontal velocity is air resistance. As the ball moves through the air, it encounters friction, which slows it down. The amount of air resistance depends on factors like:
* Speed: The faster the ball moves, the greater the air resistance.
* Shape: A round ball experiences less resistance than a flat object.
* Surface: A smooth ball experiences less resistance than a rough one.
2. Wind: If there's wind, it will directly push the ball, either slowing it down or speeding it up depending on the wind's direction.
Why the Horizontal Velocity is *Nearly* Constant:
In a simplified scenario where we ignore air resistance and wind, the horizontal velocity of the ball would remain constant. This is due to Newton's First Law of Motion, which states that an object in motion will stay in motion at a constant velocity unless acted upon by an external force.
* No Horizontal Force: When the ball leaves your hand, there are no horizontal forces acting on it (we're ignoring air resistance and wind). This means there's nothing to change its horizontal speed.
* Gravity Acts Vertically: The only force acting on the ball is gravity, which pulls it downwards. Gravity doesn't affect the horizontal velocity, only the vertical velocity.
Conclusion:
In reality, the horizontal velocity of a ball thrown through the air will gradually decrease due to air resistance and wind. However, in a simplified scenario where we ignore these factors, the horizontal velocity remains constant due to Newton's First Law of Motion.
