It depends what you mean by long and short vowels. I only know the definition based on the real length, and in that case "bang" would have a long vowel because the vowel is followed by a voiced consonant. But the distinction between long and short vowels is not always made in some dialects...
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Anonymousdoes bang have a long or short vowel soundIt's considered a short vowel (lax vowel), but -- at least in American English -- the ng that follows somewhat modifies it so that it doesn't sound exactly the same as the short a in cat to most people.