Answer on Mechanics | Relativity Question for Elise McGarva
F = S·V²,
where S is the area of the sign and V is the wind velocity. Also, we'll take into account that 40.64 cm² = 0.004064 m² and 80 km/hour = 80*1000/3600 m/s = 22.(2) m/s. So, the force is
F = 0.004064*1333.(3)² ≈ 2 N.
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