A missile is fired for maximum range at your town from a place $100\, km$ away from you. If the missile is first detected at its half way point, how much warning time will you have ? (Take $g = 10\, m/s^2$)

  • A

    $100\,s$

  • B

    $100\sqrt 2 \,s$

  • C

    $200\,s$

  • D

    $\frac{{100}}{{\sqrt 2 }}\,s$

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