Final answer:
To calculate the average speed of a car, step C in the flowchart is used: C) Calculate Average Speed (S) = D / T. Here, 'D' is the total distance travelled and 'T' is the total time taken to travel that distance.
Step-by-step explanation:
The step in the flowchart used to calculate the average speed of a car is C) Calculate Average Speed (S) = D / T, where 'D' represents the distance travelled and 'T' is the time taken for the travel. Average speed is a concept within the realm of physics and is often explained in terms of the simple formula where you divide the total distance (D) covered by an object by the total time (T) it took to cover that distance. To find the average speed, you do not merely enter the distance or time, but you must perform a calculation that involves dividing the entered distance by the entered time. It's important to note that average speed is different from average velocity, which takes direction into account. However, if the travel is in a straight line and in one direction, the magnitude of the average velocity will be the same as the average speed.