* Neglecting Air Resistance: When we assume no air resistance, the only force acting on the projectile is gravity, which acts vertically downwards. This means there is no force acting horizontally.
* Newton's First Law: Since there is no horizontal force, Newton's First Law of Motion states that the projectile will continue to move horizontally at a constant velocity. This means the horizontal component of its velocity remains unchanged throughout its flight.
Important Note: This statement is only true in ideal conditions, neglecting air resistance. In real-world scenarios, air resistance will cause the horizontal velocity to gradually decrease over time.
