I guess the only thing to calculate the motion of a ball both with and without air resistance. Without air resistance, you have straight projectile motion (straight from an introductory physics book).

Projectile motion problems can easily become algebra problems that focus on identifying the right number in a diagram and substituting it into the correct equation.

The group states that there are significant benefits to the warfighter in using a limited range projectile. "The biggest advantage is reduced risk of collateral damage," McFarlane said.