When the new Sonic The Hedgehog trailer came out this week, you probably asked yourself one question: When did Sonic get so cool?
Another question you might ask is: How fast is Sonic? Could he outrun a Cheetah? Is he faster than my car? Those are actually three questions, but we’ll let that slide since Because Science actually did the math to answer that first question. Short answer: he runs at about half the speed of sound.
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Source: Game Informer How Fast Is Sonic The Hedgehog?