Water discharges from a cylindrical tank through an orifice, as shown in the figure. The flow is considered frictionless. Initially, the water level in the tank was h = 2 m. The diameter of the tank is D = 1 m, while the diameter of the jet is d= 10 cm, and the acceleration due to gravity is g= 10 m/s2. The time taken (in seconds, up to one decimal place) for the water level in the tank to come down to h = 1 m is. I 1 I I D h d g water exit