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A circus cannon fires an acrobat into the air at an angle of 45 degrees above...

A circus cannon fires an acrobat into the air at an angle of 45 degrees above the horizontal, and the acrobat reaches a maximum height y above her original launch height. The cannon is now aimed so that it fires straight up into the air at an angle of 90 degrees to the horizontal. What is the maximum height reached by the same acrobat now?

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