like new sounds normal to me (born in NYC, US). is as good as new has a slightly different feelng for me. It is less colloquial, and I would expect it normally in a sentence like "is not new, but it is as good as new". For me 'this car is as good as new' would give me a slight pause, either bcs it does not sound as natural, or perhaps implies a tone of excusing yourself for not having a new car.
You may be right about that but in that case Duolingo is wrong: https://skmshw.by3302.livefilestore.com/y3pG1esE4xtcGN3md3XsVFOsuppfqR8XWK97SnfllZVCkmQ6728EBQjrV6h22h3zH4O6skKCmG3oN6MU9TmzXmkVzjt1HSi-jWQojjy1m85_H0ytGl01PEuyfwjtjtnl2mV2leWX8R2TdvgPFnHfL2Srxr5jESueHQlT5cnfK7xyAw/l%27automobile%20-%20the%20vehicle.jpg?psid=1
Yes, it is. I'm Italian and I can say it. The contraction with apostrophe is not always necessary. This is absolutely required with articles (lo, la, una) and prepositions made with "lo" and "la". Everything else is elective, although some habits tend to become the norm. So you can say both "quest'automobile" and "questa automobile".
You don't use the apostrophe with plural nouns. You don't say "quest'amici" in Italian.
If you interested, Italian explanations here: http://dizionari.corriere.it/dizionario-si-dice/A/apostrofo.shtml http://dizionari.corriere.it/dizionario-si-dice/E/elisione.shtml http://dizionari.corriere.it/dizionario-si-dice/E/elisione-troncamento.shtml
You might say "This car looks like a new one!" (astonishment that the new car is actually old), but that is different to saying "This car is like new" (simply stating the condition of the car).
You don't say "This car looks like new", you can say "This car looks new" ~ however this doesn't necessarily mean it's like new (the condition).
Pay attention, please, you've written "sei come forte", not "come sei forte". It's really different.
About your example - "this car is so new" - it can be translated with "come è nuova questa automobile", but it has a completely different meaning against the sentence that DL proposed - "questa automobile è come nuova".