v = d/t

d is (usually) measured in metres, but can also be measured in other units such as km, cm and mm

t is (usually) measured in seconds, but can also be measured in other units such as minutes and hours

Therefore, v is usually stated in metres per second (m s

^{-1}). However, when other units are used for distance and time, we can have other units such as km hr

^{-1}.

#### NOTE #1

1 km hr^{-1}= 0.277 m s

^{-1}

1 m s

^{-1}= 3.6 km hr

^{-1}

#### NOTE #2

This equation only works for

__uniform__motion (constant speed or stopped).#### From Graphs

Speed can be calculated from a d-t graph by finding the

*gradient*(rise/run).
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