The formula used to calculate the average speed and average velocity is virtually the same v Dt s dt with only slight difference that in the first case direction is to be mentioned. The average velocity is the displacement a vector quantity per time ratio. It is a direction-aware quantity.
Although speed and velocity are often words used interchangeably in physics they are distinct concepts.
The formula is s a b 2 displaystyle sfrac ab2 where s displaystyle s equals the average speed a displaystyle a equals the speed for the first half of the time and b displaystyle b equals the speed for the second half of the time. Average velocity V av 55 ms. If x1 and x2 are the position coordinates of a particle in uniform motion at the instants t1 and t2 respectively its velocity is given by The SI unit of velocity is metresecond and its dimensional formula is M0L1T-1 The velocity is a vector quantity. On the other hand velocity is a vector quantity.