For the cone water tank given in the figure, the relation between the flow rate q(t) and the water level h(t) is given as q(t) = 0.005h²(t). q(t) is in [m³/s] and h(t) in [m]. a. When t=0, the valve is closed and the water level is 2 [m]. Find the level of the water after 60 seconds of the valve opening.

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