Which of the following is not a factor that affects projectile trajectory?

The correct choice identifies temperature as not directly affecting projectile trajectory in the same way that the other factors do. When considering projectile motion, key aspects include forces and properties that influence how an object travels through the air.

Wind resistance and air resistance both impact the trajectory by opposing the motion of the projectile, altering its path based on speed and surface area. These forces would affect how far and fast a projectile travels.

The mass of the projectile also plays a significant role, as it influences the object’s inertia and how it interacts with gravitational pull and air drag. Heavier projectiles tend to maintain trajectory better because they are less affected by these resistive forces.

While temperature can affect the density and viscosity of air, leading to slight changes in air resistance, it does not have the direct, clear-cut impact on the trajectory in the way that wind resistance, mass, and air resistance do. Thus, while environmental conditions such as temperature may indirectly influence operational factors, they are not primary factors that determine the basic trajectory of a projectile.