Final answer:
To calculate median speed in physics, you need to know the distance traveled and the time it took, making the correct answer A. Distance and time. Speedometers measure speed, and odometers measure distance traveled.
Step-by-step explanation:
To calculate the median speed in physics, you need to know the distance traveled and the time it took to travel that distance. The correct answer to the question is A. Distance and time. Speed is defined as the distance covered per unit time and can be calculated using the formula speed = distance/time.
An example of a device used to measure time would be a stopwatch, and the change in its display indicates a change in time. The average speed of an object is the total distance traveled divided by the total time of travel, whereas the magnitude of average velocity is the total displacement divided by the total time. When the direction doesn't change and there is no return journey, average speed and the magnitude of average velocity are the same.
A car's odometer measures distance traveled, and its speedometer measures speed. When dividing the distance indicated on an odometer by the time of the trip, you are calculating the average speed.