How would you define speed?

• A. The rate at which distance is covered, regardless of direction
• B. The rate of change of velocity
• C. How fast something is moving
• D. A measure of force applied over time

Answer: (C)

Speed is a measure of how fast something is moving. It is a scalar quantity, so it only has magnitude and tells you how quickly position is changing, without regard to which way the object is traveling. Saying speed as “how fast something is moving” keeps the idea clear and intuitive, which is why this wording is the best fit. In physics, speed can also be defined as distance traveled per unit time, which matches the same idea but emphasizes the calculation perspective and still ignores direction. The other ideas point to related concepts: how velocity changes over time is acceleration, and force applied over time is impulse, neither of which is speed.