2014-08-18T18:33:34+05:30

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Velocity = change in displacement / time duration

Length and time are fundamental dimensions. So others are expressed in terms of them.

so  [ Velocity ]  = dimensions of velocity =  [ displacement ] / [ time ]
= L / T  or  L T^-1

2014-08-18T20:58:44+05:30

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velocity = displacement / time

Length
in dimensional formula is given by [L] and time is given by [T]
so
[ Velocity ]  =  [ displacement ] / [ time ]