Blood flows up a vein with a uniform radial velocity and radius of 5 Doppler ultrasound tells you that the velocity between 3 points space apart are 0.64,0.6, and 0.52 mm/s moving up the vein, repectively. Assuming blood's density of 1025 kg/m3 at the middle point, determination blood's density gradient at the niddle measurement location calculating the velocity gradient across the 80 cm height of the vessel. Solve the problem using cyclindrical coordinates but you do not need to use the full Navier-Stakes equation.