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A wind with speed \( 40 \mathrm{~m} / \mathrm{s} \) blows parallel to
\( \mathrm{P} \) the roof of a house. The area of the roof is 250

W \( \mathrm{m}^{2} \). 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 :
\[
\left(\rho_{\text {air }}=1.2 \mathrm{~kg} / \mathrm{m}^{3}\right)
\]
(1) \( 4.8 \times 10^{5} \mathrm{~N} \), upwards
(2) \( 2.4 \times 10^{5} \mathrm{~N} \), upwards
(3) \( 2.4 \times 10^{5} \mathrm{~N} \), downwards
(4) \( 4.8 \times 10^{5} \mathrm{~N} \), downwards
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