The Impossible Whopper is classified as an additions to existing product line according to the chapter's categories of new products.
Usually, when a company adds a new product which solidifies its area of product offerings, then, such action is called an "additions to existing product lines".
The additions to existing product line are also called Product line extensions.
For the question, we can see that Burger King already had a product line. He now launched a new menu item called the Impossible Whooper.
Therefore, in conclusion, the launch of the Impossible Whooper will be classified as an additions to existing product line.
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