Answer:
(i) Fig 10 (NCT) 1 (a) does not represent periodic motion,
as the motion neither repeats nor comes to 'mean position.
(ii)
Fig. 10 (NCT). l (b) represents periodic motion with period equal to 2s.
(iii)
Fig. 10 (NCT). l (c) does not represent periodic motion, because it is not
identically repeated.
(iv) Fig. 10 (NCT). l (d) represents periodic motion with
period equal to 2s.
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