Final answer:
The marble's velocity is approximately 4.55 m/s. Calculated by dividing the distance traveled (2.5 meters) by the time taken (0.55 seconds), this measure reflects the speed at which the marble rolls across a level track during the specified timeframe.
Step-by-step explanation:
The velocity of an object can be calculated by dividing the distance traveled by the time taken. In this case, the marble traveled a distance of 2.5 meters in a time of 0.55 seconds. To find the velocity, divide the distance by the time: Velocity = Distance / Time. Velocity = 2.5 meters / 0.55 seconds = 4.55 meters per second (m/s). Therefore, the velocity of the marble is 4.55 m/s.