Define the term "velocity" in the context of ballistics.

In the context of ballistics, "velocity" specifically refers to the speed of a projectile in a defined direction. This definition encompasses not only how fast the projectile is moving but also the direction in which it is traveling. Knowing the velocity is crucial for understanding the trajectory of the projectile, calculating its potential impact point, and assessing performance characteristics such as range and energy.

Other choices do not accurately define velocity. For example, total distance traveled describes distance but lacks the directional component that is integral to velocity. Similarly, the time it takes for a projectile to hit the target pertains to duration, not velocity. Finally, acceleration relates to changes in velocity over time, but it does not define the term "velocity" itself, which is fundamentally about the speed and direction of motion.