The two sentences are fine. The contractions by their nature do not distinguish the precise reduction; they just indicate the speech pattern. Use the two sentences in the same way that you use present + adjective ( He is gone/prepared/finished ) and the present perfect ( He has gone/prepared/finished ).
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AnonymousWhat's the correct form?For most purposes you'll need "is gone" for an object, but you can also use it for a person. "has gone" would normally be used only for a person because an object can't go away.
My computer/car/.. has gone or my computer is gone?