Final answer:
Speed is a scalar quantity measuring how fast an object moves, while velocity is a vector quantity that includes both speed and direction. The correct answer is C: Velocity is a measure of both speed and direction.
Step-by-step explanation:
How speed and velocity are different can be understood through their definitions in physics. Speed is a scalar quantity that only measures how fast an object is moving, without considering the direction of the movement. It can be calculated by dividing the total distance an object travels by the elapsed time. On the other hand, velocity is a vector quantity that includes both the speed of the object and the direction in which it is moving. This means that velocity provides more information about an object's motion than speed does.
Answering your multiple-choice question, the correct statement is C: Velocity is a measure of both speed and direction. This highlights the key difference between the two concepts, as speed has no directional component, whereas velocity specifies both the magnitude of the motion and its direction.