A propeller type wind turbine of $8 \mathrm{~m}$ diameter generates $4 \mathrm{~kW}$ electrical power. If the overall efficiency of power generation system is $32 \%$ and the density of air is $1.2 \mathrm{~kg} \mathrm{~m}^{-3},$ the average wind speed in $\mathrm{m} \mathrm{s}^{-1}$ is____________

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A propeller type wind turbine of $8 \mathrm{~m}$ diameter generates $4 \mathrm{~kW}$ electrical power. If the overall efficiency of power generation system is $32 \%$ and the density of air is $1.2 \mathrm{~kg} \mathrm{~m}^{-3},$ the average wind speed in $\mathrm{m} \mathrm{s}^{-1}$ is____________