Physics

The correct answer is A. Velocity is both speed and direction.

Velocity is a vector quantity that includes both the magnitude (speed) and the direction of an object's motion. It describes how fast an object is moving (speed) as well as the direction in which it is moving.

Option B, "direction, mass," is incorrect. While direction is one component of velocity, mass is unrelated to velocity. Mass is a property of an object that measures the amount of matter it contains, not its motion.

Option C, "volume, density," is also incorrect. Volume and density are unrelated to velocity. Volume refers to the amount of space occupied by an obje...