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Negative: it can kill you!
Cheap usually has a little bit of negative connotation.
Negative ionisation is usually the result, in ionic bonding, of adding one or more electrons to an atom, molecule or even an negative ion. The last of these goes more negative.
It could possibly be either, but the phrase is usually used in a negative situation.
Yes, acceleration can be positive and negative because acceleration is a vector. It has both direction and magnitude. The direction is what makes it positive or negative. Negative acceleration is usually called deceleration.