Consider a ladder sliding down a wall as in the figure. The variable a is the length of the ladder. The variable h is the height of the ladder's top at time t, and x is the distance from the wall to the ladder's bottom. Suppose that the length of the ladder is 4.5 meters and the top is sliding down the wall at a rate of 0.5 m/s. Calculated when h = 1.3. (Use decimal notation. Give your answer to three decimal places.) h

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