The wind in Toledo gusts up to a sustained speed of 20 m/s. Assuming the air density of 1.29 kg/m3, calculate the total force exerted on a flat roof having an area of 100 m2.

b

explanation:

see earlier answer

weight of the box is given as

here this is placed on the inclined of angle 42 degree

now this weight will have two components one is along the incline other is perpendicular to it

so here we need to apply a force parallel to incline opposite to its component of weight

so here the component of weight is given as

here we have

so it requires 75 n force to move it upwards

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