It affects the entire speed of the projectile is going to travel at. Shooting it at a higher initial velocity may increase the airtime of the projectile depending on the angle it was fired at.
A projectiles motion will change little because of its weight, weight, depending on propulsion will mainly affect trajectory and distance. Expotential forces(gravity, wind) tend to affect projectile...
Yes. Gravity acts downward on a projectile. That is why on Earth, objects eventually start to come down after throwing them, without the force of gravity acting downward the object would continue in...
Acceleration is equal to final velocity minus initial velocity over time. So, it will affect the outcome of the equation depending on what the initial velocity is.