In the formula for speed, which other measurement is directly involved along with distance?

The formula for speed is defined as the distance traveled divided by the time it takes to travel that distance. This means that in order to calculate speed, you need to know both the distance covered and the time taken to cover that distance. By focusing on time along with distance, you can accurately determine the speed of an object.

In contrast, other options like amplitude, frequency, and velocity do not directly contribute to the basic calculation of speed. Amplitude pertains to the maximum extent of a wave or oscillation, and frequency defines how often an event occurs in a specific time period. Velocity, while related closely to speed, includes direction and is a vector quantity. Thus, time is the essential factor required alongside distance to yield the measurement of speed.