Scalars are quantities that are fully described by a magnitude (or numerical value) alone.
Vectors are quantities that are fully described by both a magnitude (or numerical value) and a direction. For example,  More...

Distance is a scalar quantity that refers to "how much ground an object has covered" during its motion.

Displacement is a vector quantity that refers to "how far out of place an object is"; it is the object's overall change in position.

Suppose you walks 4 meters East, 2 meters South, 4 meters West, and finally 2 meters North. Even though you have walked a total distance of 12 meters, your displacement is 0 meters.

Speed = Distance / Time

Distance = Speed * Time

Time = Distance / Speed

Acceleration is a vector quantity that is defined as the rate at which an object changes its velocity. An object is accelerating if it is changing its velocity.

• Distance from the object to the mirror is exactly the same as the image to the mirror
• The object-image line is perpendicular to the mirror surface
• Images are upright but flipped horizontally