Velocity is a vector quantity, so a different direction makes a different velocity. Speed is a scalar quantity, where direction makes no difference.
Since a speedometer reads the same regardless of direction of motion, it is providing speed, not velocity.
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Final Velocity minus Initial Velocity (all together this is the change in velocity) divided by the average acceleration will give you the time it took for the object to reach that speed.(Vf - Vi) / Aaverage = Time
Generally wind speed is measured using a cup anemometer (wind speed measuring device). The velocity of a flatulation will decrease as it leaves the anus, so to properly measure the velocity the measurement would have to be done before the exit. Theoretically you could measure the velocity of the gases by placing a miniature cup anemometer with walls inside the rectal tract close to the anus to give an approximate wind speed (velocity) of the gases.
If I walk 4 kilometers in an hour, my average speed during that hour was 4 km/hour. My instantaneous speed may well have been faster at times, and slower at other times, 4 km/hour is only the average.
If you know average speed then you cannot determine the acceleration: the very nature of being a average hides all the increases and decreases in speed which are the accelerations (technically, acceleration is change of speed in a direction). All average speed tells you is the constant speed at which you require to travel to cover the given distance in the given time; as the speed is constant, the acceleration is zero.
Frequency = (speed)/(wavelength) = 12/2 = 6 per second = 6 Hz.Note:The question doesn't give enough information to describe the velocity. "12" is nota velocity, but it can be a speed, and we've assumed that it is. Fortunately, 'speed'is all we need to answer the question.