1.

The amplitude and the time period in a S.H.M. is 0.5 cm and 0.4 sec respectively. If the initial phase is \[\pi /2\] radian, then the equation of S.H.M. will be

A.            \[y=0.5\sin 5\pi t\]            
B.            \[y=0.5\sin 4\pi t\]
C.            \[y=0.5\sin 2.5\pi t\]         
D.            \[y=0.5\cos 5\pi t\]
Answer» E.


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