Here's why:
* Neglecting Air Resistance: In ideal projectile motion, we typically ignore air resistance. This means the only force acting on the projectile is gravity, which acts vertically downwards.
* Horizontal Motion is Independent: The horizontal and vertical components of projectile motion are independent of each other. This means the horizontal velocity remains constant throughout the flight, as there is no force acting in that direction.
* Acceleration is the Rate of Change of Velocity: Since the horizontal velocity is constant, the horizontal acceleration is zero.
Important Note: In real-world scenarios, air resistance does exist and will cause a slight horizontal deceleration, but this is usually negligible for short-range projectiles.
