# In designing airplanes, an important feature is the so-called drag factor; that is, the retarding force exerted

## Question:

In designing airplanes, an important feature is the so-called drag factor; that is, the retarding force exerted on the plane by the air. One model measures drag by a function of the form

where v is the velocity of the plane and A and B are constants. Find the velocity (in terms of A and B) that minimizes F(v). Show that you have found the minimum rather than a maximum.

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**Related Book For**

## Calculus For Business, Economics And The Social And Life Sciences

**ISBN:** 9780073532387

11th Brief Edition

**Authors:** Laurence Hoffmann, Gerald Bradley, David Sobecki, Michael Price