Study the following statements. I. When stone is rotated at greater speed in circular path, grea...

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Study the following statements.
I. When stone is rotated at greater speed in circular path, greater force is required.
II. When stone is rotated in a circle of smaller radius, greater force is required.
III. When stone is rotated at greater speed in a circle of smaller radius, smaller force is required.
Which of the following statement(s) is/are correct?
(a) Both I and II
(b) Both II and IV
(c) Both I and III
(d) I, II and III
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