In athletics a headwind is expressed in negative terms eg - 5 m/s a wind in your face of 5 metres per second. A tailwind is expressed in positive terms eg + 5 m/s.
The positive & negative seem superfluous as a headwind and tailwind are self explanatory
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100 mph
The resultant velocity of a plane is 75 km/hr.
Negative * positive = negative Positive * positive = positive Negative * negative = positive
No, a negative plus a negative is a negative
A negative plus a negative equals a negative.