Question

which best describes why projectiles move in a curved path? they have constant horizontal velocity and vertical acceleration. they have horizontal acceleration and constant vertical velocity. they have horizontal momentum and constant vertical velocity. they have horizontal acceleration and vertical momentum.

Explanation:

In projectile - motion, there is no horizontal acceleration (neglecting air - resistance), so the horizontal velocity is constant. There is a vertical acceleration due to gravity ($g$) acting downwards.

Answer:

They have constant horizontal velocity and vertical acceleration.