Why do projectiles have no horizontal acceleration (assuming no air resistance)

Why do projectiles have no horizontal acceleration (assuming no air resistance)

Correct answer: A. Projectiles always have gravity acting on them in the vertical direction, but NO acceleration acting on them horizontally. This means the horizontal speed of the projectile never changes through the duration of the motion. This is because there are no horizontal forces acting on it once it leaves the ground. The only thing propelling it forward is its momentum.

Verified by Knowlaxy Team (Jason Kuma)