The force of the wind blowing on a vertical surface varies jointly as the area of the surface and the square of the velocity.

Question

The force of the wind blowing on a vertical surface varies jointly as the area of the surface and the square of the velocity. If a wind of 20 mph exerts a force of 10 lb on a surface of ft², how much force will a wind of 30 mph place on a surface of 2 ft²?

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