The Concept of Speed vs Velocity Explained

What is the difference between speed and velocity?

What best describes the measured number of 13.5 mph at mile marker four of a bike race?

Speed vs Velocity

Speed and velocity are both terms used to describe how fast an object is moving, but they have different meanings.

Speed is a scalar quantity, which means it only has magnitude (numerical value) and no direction. It is defined as the distance traveled per unit of time. For example, if you travel 60 miles in one hour, your speed is 60 mph. Speed tells you how fast you are going without specifying in what direction.

Velocity, on the other hand, is a vector quantity, which means it has both magnitude and direction. It is defined as the rate at which an object changes its position. For example, if a car is traveling north at 50 mph, its velocity is 50 mph north. Velocity gives you not only the speed but also the direction in which the object is moving.

Therefore, the measured number of 13.5 mph at mile marker four of a bike race is indicative of the speed of the bike rider, as the direction of motion is not specified.