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1. Can I Develop a good professional quality (realistic physics, collision detection, particle effects, realtime shadows and AI) 3d racing engine using only A6 and a 3d modelling software like 3ds max.

Yes.

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2. Can Havok be used inside A6.

Yes, but before looking into this you should request a price quote from Havok to see if it is within your budget.

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3. A6 pro and commercial versions have a physics engine and in case of commercial version its only 1 object, what does this mean.

At any given time only 1 object can have automatic physics calculation applied to it. For a racing game you normally need 5 physics objects per car.

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4. Can I see some examples of A6 physics and collision detection engine at work.

To be found on the download page.

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5. What is Newton.

A free (?) third-party physics plugin providing similar functionality to Havok or GameStudio physics.

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6. Can I web-enable the A6 output so that it is viewable in A WEB-browser.

No, A6 is a stand-alone engine that does not run in a web browser and requires a PC.