The velocity v of blood that flows in a blood vessel withradius R and length l at a distance rfrom the central axis isv(r) = (P/4ηl)(R^2 - r^2)where P is pressure difference between the ends of the vessel andη is the viscosity of the blood. Find the average velocity(with respect to r) over the interval 0 ≤ r ≤ R.Compare the average velocity with the maximum velocity.