Which of the following statements are correct? I. Centripetal accel...

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Which of the following statements are correct?
I. Centripetal acceleration is always directed towards the centre.
II. Magnitude of the centripetal acceleration is \( \frac{\mathrm{v}^{2}}{\mathrm{R}} \).
III. Direction of centripetal acceleration changes pointing always towards the centre.
(a) I and II
(b) II and III
(c) I and III
(d) I, II and III
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