The 'speed' of a body cannot be negative.
But if you are stating the 'velocity' then it can be negative. Negative velocity means
it is going opposite to the direction that you decided to call the positive direction.
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No. "Speed" is a scalar quantity, without sign or direction.
But "velocity" can, if the object is moving opposite to the direction
that you defined as the positive direction.
No, Speed is always greater than or equal to zero. However, velocity can be negative, which just means you have a positive speed in the opposite direction! (scalar(number) versus vector).
The negative part in negative acceleration is indicating direction, as acceleration is a vector quantity. Speed however, is a scalar and has magnitude only and therefore cannot be negative. An example could be -2.6ms-2 meaning that there is an acceleration of 2.6ms-2 but in the opposite direction to other vectors.
Negative Slope can be your speed, position, and/or acceleration, as long as you X increases but your Y decreases.
positive acceleration is when things speed up; negative acceleration is when things slow down; and zero acceleration is when things do not speed up or slow down, this is called constant speed, or no change in velocity.
Yes. Going under the speed limit is (-) going over the speed limit is (+) going on the speed limit is (0)