During a thunderstorm, winds with a speed of 47.7 m/s blow across a flat roof with an

Question:

During a thunderstorm, winds with a speed of 47.7 m/s blow across a flat roof with an area of 668 m2.
(a) Find the magnitude of the force exerted on the roof as a result of this wind.
(b) Is the force exerted on the roof in the upward or downward direction? Explain.