Let `v = 54 km h^(-1) = n_(2) m s^(-1)`. `[v] = LT^(-1) , a = 0 , b = 1, c = -1` `n_(2) = 54 [(kg)/(g) ]^(0) [ ( km)/(m)]^(1) [(h) /( s)]^(-1)` `= 54 xx 1 xx 1000 xx [ 3600 ]^(-1) = ( 54 xx 1000)/( 3600) = 15 ` Hence , `54 km h ^(-1) = 15 m s^(-1)`.
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