![](https://4.bp.blogspot.com/-nsVLPGHJ9uc/XEORKOUPwBI/AAAAAAAAAik/hx-fI6-HHbYSxf05I1FDxOrm1lj9Loa0ACLcBGAs/s1600/average%2Bspeed%2Btotal%2Bdistance%2Btraveled%2Btime%2Btaken.png)
![](https://2.bp.blogspot.com/-NDvKNzGnIgI/XEOJdbZGroI/AAAAAAAAAiM/-re83UV4v2U_FfagP1aJAxlIuA9ZycMEgCLcBGAs/s1600/average%2Bvelocity.png)
Here the distance is the total (along the path) length traveled. Velocity is a vector quantity. If an object undergoes a vector displacement, s, in a time interval, t, then average velocity is equal to vector displacement divided by time
![](https://3.bp.blogspot.com/-vfaSLaroKFo/XEOQFxbkqTI/AAAAAAAAAic/iiDr5kH8wFQuBSXzwxz1Evs7ML574EWHgCLcBGAs/s1600/average%2Bvelocity%2Bvector%2Bdisplacement%2Btime%2Btaken.png)
Or
![](https://2.bp.blogspot.com/-KHjC2luny_A/XEPeIGAVXvI/AAAAAAAAAiw/1b4ohXZDsf4zPs2UGaF6WWwJnoMV1H_QwCLcBGAs/s1600/average%2Bvelocity%2Bvector%2Bdisplacement%2Btime%2Btaken.png)
The direction of the velocity vector is the same as that of the displacement vector. The units of velocity (and speed) are those of distance divided by time, such as m/s or km/h.
Acceleration also a vector quantity, measures the time-rate-of-change of velocity:
![](https://1.bp.blogspot.com/-yxqCKf1wKCg/XEPg1Ztb2XI/AAAAAAAAAi8/_WxmiwwoP8AnpasdFRkkkNYaopII0pOOACLcBGAs/s640/average%2Bacceleration%2Bchange%2Bin%2Bvelocity%2Bvector%2Btime%2Btaken.png)
![](https://2.bp.blogspot.com/-QfGf1WA3uIc/XEPiSy-TNVI/AAAAAAAAAjI/O8d-y19nHEwifnwN1VNBbc1Y-55MVIM7wCLcBGAs/s1600/average%2Bacceleration%2Bchange%2Bin%2Bvelocity%2Bvector%2Btime%2Btaken%2Bformula.png)
Where Vi is the initial velocity, Vf, is the final velocity, and t is the time interval over which the change occurred. The units of acceleration are those of velocity divided by time. A typical example is (m/s)/s or ms^2 )
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