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The motion of a particle executing SHM is described by
\[
x=A \cos (\omega t+\phi)
\]
\( \mathrm{P} \)
If at \( t=0 x=1 \mathrm{~cm} \) and \( v=\omega \mathrm{cm} / \mathrm{s} \). Its initial phase
W and amplitude are respectively :-
(1) \( \frac{7 \pi}{4} ; \sqrt{2} \)
(2) \( \frac{\pi}{4} ; \sqrt{2} \)
(3) \( \frac{3 \pi}{4} ; \sqrt{2} \).
(4) \( \frac{\pi}{4} ; 1 \)
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