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The drag force on a boat varies jointly as the wetted surface area and the square of the velocity of a boat. If a boat going 6.5 mph experiences a drag force of 86 N when the wetted surface area is 41.2 ft², how fast must a boat with 28.5 ft² of wetted surface area go in order to experience a drag force of 94N?

Learn how to calculate the required speed of a boat given the joint variation relationship between drag force, wetted surface area, and velocity. This example involves a boat going 6.5 mph with 41.2 ft² of wetted surface area experiencing a drag force of 86 N. Determine the speed for a boat with 28.5 ft² of wetted surface area to experience a drag force of 94 N.

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