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No. if you are accelerating from rest, for example, and reach 80 mph starting from 0, your average velocity is 40 mph, but your speed is 80 mph at the end. Generally we speak of average speed, so if it takes one hour to go 60 miles your average speed is 60 mph, even though you may have slowed and then gone faster at certain times.
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JudyNo. The dimensions of speed are [LT^-1] that is distance per unit of time (for example metres per hour). Therefore speed per hour would have units [LT^-2] are units for acceleration. Secondly, average sped is speed averaged over a period of time - as opposed to the speed over a shorter period.
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