The displacement of an elastic wave is given by the function : $y = 3\, sin\,\omega t + 4\, cos\,\omega t$ where $y$ is in $cm$ and $t$ is in $s$. The resultant amplitude is ...... $cm$

  • A

    $3$

  • B

    $4$

  • C

    $5$

  • D

    $7$

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