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2014-10-11T22:11:03+05:30

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Speed can never be negative.
Velocity is a vector quantity. It has a magnitude and a direction associated with it. The magnitude is always positive. The direction can be positive or negative. As speed is the magnitude of velocity, it can't be negative. 
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2014-10-11T23:07:23+05:30
no it is not possible for speed to be negative because speed cannot be zero or below as it is a vector quantity.
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