SPEED OF FLIGHT In a model† developed by C. J. Pennycuick, the power P required by a bird...

SPEED OF FLIGHT In a model† developed by C. J. Pennycuick, the power P required by a bird to maintain flight is given by the formula

where v is the relative speed of the bird, w is the weight, p is the density of air, and S and A are positive constants associated with the bird’s size and shape. What relative speed v will minimize the power required by the bird?