Question

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after an initial force launches a projectile, the only force acting on it as it moves through the air is \boxed{}, which causes its trajectory to curve downward. you can determine a projectiles trajectory if you know its initial \boxed{}.
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Explanation:

1. For projectile motion (ignoring air resistance), the only constant force acting on the object after launch is the gravitational pull toward Earth, which curves its path downward.
2. To define a projectile's trajectory, you need to know its initial velocity (which includes both speed and direction, as these determine the shape of the curved path).

Answer:

After an initial force launches a projectile, the only force acting on it as it moves through the air is gravity (or gravitational force), which causes its trajectory to curve downward. You can determine a projectile's trajectory if you know its initial velocity (or speed and direction).