A stone projected at an angle of $60^o$ from the ground level strikes at an angle of $30^o$ on the roof of a building of height $‘h= 30\,m ’$ . Find the speed of projection(in $m/s$ ) of the stone

821-1907

  • A

    $30$

  • B

    $40$

  • C

    $50$

  • D

    $60$

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