Which of the following statement(s) is/are correct? I. The concept of energy is central to physi...

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Which of the following statement(s) is/are correct?
I. The concept of energy is central to physics and expression for energy can be written for every physical system.
II. Law of conservation of energy is not valid for all forces and for any kind of transformation between different forms of energy.
(a) Only I
(b) Only II
(c) Both I and II
(d) None of these
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