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The issue is you have a semicolon immediately after the if. That separates the if from the braces after it.
When it runs into the else, it expects that the last set of braces was "connected" with an if statement -- but due to that semicolon, they aren't.
I suggest you remove that semicolon, as well as the one after your else clause (which does the same thing for the else -- which will not report an error but will make your program behave incorrectly).
You're not reading distance and acceleration from the input, acc. is initialized to 9.807, and distance is calculated from it. So you can remove that line.
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