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).
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Yes velocity is a vector that has both speed and direction. So if you are going 30 mph in one direction that may be positive, but if you are going in reverse that may be negative.
No.
Impossible.
Frequency = Speed/Wavelength.Since the speed is not known, it is not possible to provide a more useful answer to the question.Frequency = Speed/Wavelength.Since the speed is not known, it is not possible to provide a more useful answer to the question.Frequency = Speed/Wavelength.Since the speed is not known, it is not possible to provide a more useful answer to the question.Frequency = Speed/Wavelength.Since the speed is not known, it is not possible to provide a more useful answer to the question.
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.