Charlotte throws a paper airplane into the air, and it lands on the ground. Which best explains why this is an example of projectile motion?

Projectile motion combines horizontal motion with vertical acceleration caused by gravity. After Charlotte releases the airplane, its forward motion continues because of inertia while gravity pulls it downward, so the choice describing horizontal inertia and the vertical pull of gravity is correct. In real life, air resistance can also affect the airplane, but it does not change the basic explanation.

AI-written and checked against the verified answer.