Crap. After some internet searching here's what I've found:
Astronaur Pam Melroy flew the space shuttle Discovery to the International Space Station to complete? - Yahoo! Answers (same approach as I said above, but with different numbers)
Note that the linked problem asks for the relative velocity between the shuttle and station. If we do that here, you get 2.02 m/s (0.5 + 1.52), which makes up half the difference between your answer and the provided answer. I'm not sure where the remaining 0.5 m/s is coming from, and since the question just asks for the shuttle velocity I feel like the relative velocity between them is irrelevant.
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