**speed**is equal to the total distance traveled divided by time taken:

**Or**

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

**Or**

**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:

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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