Fig. 2 shows a cross-section of a bowl containing water. When the height of the water level is h cm, the volume, V cm³, of water is given by V = π(1/2h² + h). Water is poured into the bowl at a constant rate of 2 cm³ s¹. Find the rate, in cm s¹, at which the height of the water level is increasing when the height of the water level is 3 cm. ​