An acceleration of 3.5 m/s² means that the object's velocity increases by 3.5 meters per second for every second that elapses. The magnitude of the acceleration is 3.5 m/s², and it is positive if there is no negative sign associated with it. Therefore, if we assume the given acceleration has no additional context (like a negative sign), the correct interpretation is:
The object is traveling 3.5 m/s/s in a positive direction.
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