Final answer:
We used the definition of instantaneous speed in this investigation, which represents the magnitude of velocity at a specific instant in time without a direction. Average speed, on the other hand, is the total distance traveled divided by the elapsed time.
Step-by-step explanation:
The definition of speed that we used in this investigation is instantaneous speed. Instantaneous speed is the magnitude of instantaneous velocity and represents the speed at a specific instant in time. It does not have a direction associated with it, making it a scalar quantity. On the other hand, average speed is the total distance traveled divided by the elapsed time.