이유는 다음과 같습니다.
* 속도 : 속도는 속도와 방향의 척도입니다.
* 가속도 : 가속도는 속도 변화율입니다.
If velocity is constant, it means neither the speed nor the direction is changing. Since there's no change in velocity, there's no acceleration.
예 : A car traveling at a steady 60 mph in a straight line has a constant velocity. Because its velocity is not changing, its acceleration is 0.
