The displacement of an elastic wave is given by the function \( y=3 \sin \omega t+4 \cos \omega ...

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The displacement of an elastic wave is given by the function \( y=3 \sin \omega t+4 \cos \omega t \), where \( y \) is in \( \mathrm{cm} \) and \( t \) is in second. The resultant amplitude will be
(a) \( 15 \mathrm{~cm} \)
(b) \( 4 \mathrm{~cm} \)
(c) \( 5 \mathrm{~cm} \)
(d) \( 3 \mathrm{~cm} \)
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