Question

which measurements are required to calculate the average speed of a car driving on a road?
a. ○ time and distance
b. ○ time and direction
c. ○ mass and distance
d. ○ mass and direction

Explanation:

To calculate average speed, we use the formula \( \text{Average Speed} = \frac{\text{Total Distance}}{\text{Total Time}} \). So we need distance (total path length) and time. Direction is related to velocity (a vector), not speed (a scalar), and mass is irrelevant for speed calculation. Option A has time and distance, which match the formula.

Answer:

A. time and distance