A fluid is moving to the right between two horizontal stationary plates as shown above. Let y represent the elevation above the lower plate in meters. Let u(y) represent the velocity of a fluid layer y meters above the lower plate. The fluid's horizontal velocity at any y above the lower plate is given by u(y) = 4*y- y2. Determine the fluid's velocity gradient in meters/sec per meter (ie. determine du/dy) for the fluid at y = 0.7 meters above the bottom place