Projectile motion is governed by gravity. Gravity acts downwards, causing a vertical acceleration on the projectile. This vertical acceleration is constant and is usually denoted as 'g' (approximately 9.8 m/s²).
However, gravity does not act horizontally. There are no forces acting in the horizontal direction (assuming we ignore air resistance).
Therefore, the horizontal acceleration is zero.
Important Note:
* Ignoring air resistance: The statement that horizontal acceleration is zero assumes we are ignoring air resistance. In reality, air resistance can create a horizontal force opposing the motion, resulting in a non-zero horizontal acceleration.
* Constant horizontal velocity: Because there's no horizontal acceleration, the horizontal velocity of a projectile remains constant throughout its flight.
Let me know if you'd like more explanation about any of these concepts!
