A body is thrown at angle $30^{\circ}$ to the horizontal with the velocity of $30\; m / s$. After $1\;sec$, its velocity will be (in $m/s$) $\left(g=10\; m / s ^{2}\right)$

  • A

    $10\sqrt 7 $

  • B

    $700\sqrt {10} $

  • C

    $100\sqrt 7 $

  • D

    $\sqrt {40} $

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