A string of mass $m$ and length $l$ hangs from ceiling as shown in the figure. Wave in string moves upward. $v_A$ and $v_B$ are the speeds of wave at $A$ and $B$ respectively. Then $v_B$ is

819-1305

  • A

    $\sqrt 3v_A$

  • B

    $v_A$

  • C

    $< v_A$

  • D

    $\sqrt 2v_A$

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