A) \[\frac{\pi }{2}\]
B) \[-\frac{\pi }{2}\]
C) \[\pi \]
D) \[0\]
Correct Answer: A
Solution :
\[x=A\cos (\omega t+\phi )\] Let \[t=0,\text{ }x=0\] \[0=\cos \phi \] \[\cos \frac{\pi }{2}=\cos \phi \] \[\theta =\frac{\pi }{2}\]You need to login to perform this action.
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