Here's why speed can't be negative:
* Speed measures how fast something is moving. It doesn't care if the object is moving forward, backward, up, down, or in circles.
* Distance is always positive. We measure the distance traveled, and distance can't be negative.
* Time is always positive. We measure the time it takes to travel a certain distance, and time can't be negative.
Example:
* If you drive 50 miles per hour, you're going 50 mph regardless of whether you're heading north, south, east, or west.
* If you walk 3 meters in 10 seconds, your speed is 0.3 meters per second, no matter which direction you walked.
Velocity, on the other hand, is a vector quantity. It has both magnitude and direction. So, velocity can be negative because it indicates direction. For example, a velocity of -5 m/s means you're moving 5 meters per second in the negative direction (like moving backwards).
