What is required to fully describe the displacement of a moving body?
Both magnitude and direction
Displacement is defined as the shortest straight-line distance from a body's initial position to its final position, drawn as an arrow between the two points.
Because this arrow has both a length and an orientation in space, displacement is a vector quantity, unlike distance which is a scalar carrying only size.
Stating just the magnitude leaves the final position ambiguous, and stating just the direction says nothing about how far the body has moved, so neither alone is sufficient.
Hence, to describe the displacement of a moving body completely, one must specify both its magnitude and its direction.
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