A wind with speed 40 m/s blows parallel to the roof of a house. The area of the roof is 250 m² • 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 : [ ${\mathrm{\rho }}_{\mathrm{air}}$ = 12 kg/m³ ] 

• A

  4.8 x10⁵ N, upwards

• B

  24 x 10⁵ N, upwards

• C

  24 x 10⁵ N, downwards

• D

  4.8 x 10⁵ N, downwards