Kant’s division of philosophy

Except for logic, both physics and ethics, according to Kant’s division of philosophy, have an “empirical” part, in addition to a “non-empirical” or “a priori” part. (The Latin expression ‘a priori’ in philosophy means “coming prior to, and standing before

Kant tries to answer the question “what can be considered good without qualification”. What is his answer, and how does he explain his answer? Is his answer unique, in the sense that there can only be exactly one thing that can be considered “good without qualification”? Explain.