A string of mass $2.5\, kg$ under some tension. The length of the stretched string is $20\, m$. If the transverse jerk produced at one end of the string takes $0.5\, s$ to reach the  other end, tension in the string is .... $N$

  • A

    $100$

  • B

    $200$

  • C

    $300$

  • D

    $400$

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