`3.0 ms^(-2) = ............. km h^(-2)`

Explanation

`3.0 ms^(-2) = 3.0 (m)/(s^(2)) = (3.0 xx 10^(-3))/((1//3600)^(2)) (km)/(h^(2))`
`[ because 1 m = (1)/(1000) km = 10^(-3) km]`
`= 3.0 xx (3600)^(2) xx 10^(-3) (km)/(h^(2))`
`= 3.888 xx 10^(4) (km)/(h^(2))`
`= 3.888 xx 10^(4) km h^(-2)`