question in escape altitude

hi , i am working on this problem where i found the Velocity U and know i looking for the escape altitude.  My solution is a bit different from the one provided by the book. I am attaching my work and the solution given by the book. What am i missing ?
altitude.pdf
c_hocklandAsked:
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c_hocklandConnect With a Mentor Author Commented:
ok , got the solution ....thanks anyway.
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