A transverse wave is passing through a stretched string with a speed of $20\  m/s$ . The tension in the string is $20\ N$ . At a certain point $P$ on the string, it is observed that energy is being transferred at a rate of $40\ mW$ at a given instant. Find the speed of point $P$

  • A

    $40\ cm/s$

  • B

    $20\ cm/s$

  • C

    $2\ mm/s$

  • D

    $20\ mm/s$

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