Question

which of the following statements are true of projectile motion? include all that apply.
a. gravity is the only force influencing the motion of a projectile.
b. projectiles are objects that experience free fall.
c. projectiles move through the air with an overall constant velocity.
d. if moving fast, projectiles can experience considerable air resistance.
e. the acceleration of a projectile is downward.
f. none of these statements are true of projectile motion.

Explanation:

• Statement a: Ideal projectile motion assumes gravity is the only force, ignoring air resistance.
• Statement b: Projectiles are in free fall as they only accelerate due to gravity (in ideal conditions).
• Statement c: Projectiles have changing velocity (vertical component changes due to gravity), so overall velocity is not constant.
• Statement d: Standard projectile motion models neglect air resistance, so this is not part of the core definition.
• Statement e: Projectile acceleration is downward (due to gravity), constant at $g$.

Answer:

a. Gravity is the only force influencing the motion of a projectile.
b. Projectiles are objects that experience free fall.
e. The acceleration of a projectile is downward.