Question #2: The width, w, of water in a certain drainage pipe with negligible slope is given as a function of the depth, h, as: w = 2rh-h, where r is the radius of the pipe. 0.5m Sewer Find the rate of change of the width with respect to the height, du/dh, when h = 0.2 m, if the radius of the pipe is 0.25 m. Keep the mks system of units.