* Speed vs. Velocity: It's important to distinguish between speed and velocity.
* Speed is the rate at which an object covers distance, regardless of direction. It's always a positive value.
* Velocity is the rate at which an object changes its position, taking direction into account. It can be positive, negative, or zero.
* Average Speed: Average speed is calculated by dividing the total distance traveled by the total time taken. Since distance is always a positive value, average speed will also always be positive.
Example:
Imagine a car traveling in a circle. It starts and ends at the same point. While its *displacement* (change in position) is zero, the *distance* traveled is the circumference of the circle. Therefore, the car's average speed will be non-zero even though its average velocity is zero.
In Summary:
* A moving body always covers some distance, meaning it has non-zero speed.
* Average speed is the total distance traveled divided by the total time, so it cannot be zero for a moving body.
