Question

why does a car traveling at a constant speed of 50 mph around a circular track have a changing velocity? because its displacement after one lap is not zero. because its speed is not truly constant. because its direction of motion is constantly changing. because the speedometer is inaccurate on turns.

Explanation:

Velocity is a vector quantity that has both magnitude (speed) and direction. When a car travels around a circular track at a constant speed of 50 mph, its speed (the magnitude part) remains the same. However, its direction of motion is constantly changing because it is moving along a circular path. Since velocity depends on direction, a change in direction means the velocity is changing.

Answer:

Because its direction of motion is constantly changing.