In which of the following cases, there is no loss of mechanical energy? I. When a ball is moving...

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In which of the following cases, there is no loss of mechanical energy?
I. When a ball is moving on a rough surface under perfect rolling.
II. When a ball in sliding on a rough surface.
III. When a ball is falling under gravity.
Which of the above statement(s) is/are correct?
(a) Both I and II
(b) Both I and III
(c) Both II and III
(d) I, II and III
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