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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.
you read it like this 3x1=3 genius
Water hydrates your body helps you focus... and keeps you alive.. you need it.. it's one of the most essential things on Earth for humans, negative effects would be.. if you drink too much your blood will get diluted and that isn't too good for you... also you could drown in it.. Water is colourless, odourless and tasteless.. but we need it to survive
Positive feedback must be temporary and relatively rapid because it’s stimulator! the body can’t adapt to the constant instability of the changes and possibly the destruction of homeostasis.
When a body covers a displacement in the opposite direction of our reference direction then displacement will be negative.