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Velocity is defined as the speed of an object in a given direction. For velocity to be fully described, both the speed (scalar quantity) and the direction (vector component) are required.
From the given options, the one that includes a description of velocity is:
"A car travels east at 45 kilometers per hour."
This statement specifies both the speed (45 kilometers per hour) and the direction (east), thereby defining velocity. The other options mention only the speed or distance moved, without specifying a direction.