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A wind with speed \( 40 \mathrm{~ms}^{-1} \) blows parallel to the roof of a house. The area of the roof is \( 250 \mathrm{~m}^{2} \). Assuming that the pressure inside the house is atmospheric pressure, the force exerted by the wind on the roof and the direction of the force will be \( \left(\rho_{\text {air }}=1.2 \mathrm{kgm}^{-3}\right) \)
(a) \( 2.4 \times 10^{5} \mathrm{~N} \), downwards
(b) \( 4.8 \times 10^{5} \) downwards
(c) \( 4.8 \times 10^{5} \mathrm{~N} \), upwards
(d) \( 24 \times 10^{5} \mathrm{~N} \), upwards
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