Final answer:
Vector quantities convey both magnitude and direction, providing a complete description of physical quantities such as displacement, velocity, and force.
Step-by-step explanation:
Vector quantities convey information about magnitude and direction. Unlike scalar quantities, which only have magnitude, vectors provide a complete description of a physical quantity that has directionality. For example, displacement, velocity, acceleration, and force are all vector quantities. In one-dimensional motion, the direction can be indicated with a sign (positive or negative), but in two dimensions or more, it is described relative to a reference frame using an arrow that points in the direction and has a length proportional to the magnitude.
Examples of Vector Quantities:
- Velocity is a vector as it describes the rate of change of position with both speed (magnitude) and direction of motion.
- When multiplying a vector by a scalar, the magnitude changes but the direction remains the same.
In summary, the correct answer to the question is a) magnitude and direction. Therefore, a vector quantity, such as force, is correctly described as having both magnitude and direction.