Short answer: Because it doesn't have a direction.
Medium answer: Speed can't because it doesn't have direction - whichever direction it's going in, it's going forward. Velocity, on the other hand, can be negative because it does have direction - if it's negative, it's going backwards.
Long answer: (and it's very long. Bear with me here.)
In mechanics, which is the area of math we're dealing with, there are two types of quantities: vector and scalar. Vectors have magnitude (size) and direction; scalars just have direction.
For example, imagine a brick. The brick is quite heavy, and we can describe its heaviness in two ways. We can say that it has a large mass, or we can say that it has a large weight. Mass is a scalar: it doesn't change. If you throw the brick at a wall, it's going to make more or less the same impression as if you throw it at the floor, and no matter which direction you pull it in or where you put it, it always has the same mass.
Weight, on the other hand, is a vector: it has a specific direction - down, or more accurately, the center of the Earth. If you moved the brick 20 miles straight up, it's going to weigh less than if you moved it 20 miles straight down (not very much less, but still). The fact remains that weight always acts down.
The equivalent of the mass/weight difference in the situation we're talking about is speed and velocity. Velocity is a vector - it has a direction and is assumed to always act in that direction. Therefore, if it's negative, it is acting against that direction and moving backwards. Speed is a scalar - like I said before, it doesn't have a direction, so wherever it's going is forward.
If you have a negative acceleration, you are slowing down. Acceleration is the rate of change of speed, so a negative acceleration means a decrease in speed.
see speed cannot de negative se speed = distance / time and neithr distance nor time can be negative they r always positive so speed cannot be negative but velocity can be negative
No, the average speed cannot be negative because speed is a scalar quantity that represents the rate at which an object moves in a particular direction. Negative speed would imply moving in the opposite direction, which is typically referred to as velocity.
No, in physics, speed and displacement are scalar quantities that represent magnitudes and cannot be negative. However, the direction of motion can be indicated by assigning a negative or positive sign to the speed or displacement value.
No, the speed of a particle cannot be negative. Speed is a scalar quantity and is always positive, representing the magnitude of the velocity of an object. Negative values are used to represent the direction of motion in one-dimensional motion.
If you have a negative acceleration, you are slowing down. Acceleration is the rate of change of speed, so a negative acceleration means a decrease in speed.
see speed cannot de negative se speed = distance / time and neithr distance nor time can be negative they r always positive so speed cannot be negative but velocity can be negative
No, surds can never be negative.
No, the average speed cannot be negative because speed is a scalar quantity that represents the rate at which an object moves in a particular direction. Negative speed would imply moving in the opposite direction, which is typically referred to as velocity.
Never.
I am sure that learning can never be negative.
No, in physics, speed and displacement are scalar quantities that represent magnitudes and cannot be negative. However, the direction of motion can be indicated by assigning a negative or positive sign to the speed or displacement value.
No. It would NEVER be negative.
i can be a negative number a negative number or a zero but i am never a decimal or fraction
The sum of two negative integers is never positive.
never a negative
In classical physics, negative speeds do not make sense as it implies going backward in space. In some contexts, negative speeds can be used in mathematical models or theoretical physics to represent certain relationships, but they do not have a physical interpretation as traveling at a negative speed.