Question

fill in the blank question
the measure of the distance an object travels per unit of time is the
of the object.
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Explanation:

In physics (a subfield of Natural Science), the definition of speed (or velocity, but in the context of distance per unit time without direction, speed) is the distance an object travels divided by the time taken, i.e., distance per unit time. So the term that fits is "speed" (or "velocity" if direction is considered, but the question's phrasing about distance per unit time aligns with speed as a scalar quantity).

Answer:

speed