Figure shows a projectile thrown with speed $u=20 \,m / s$ at an angle $30^{\circ}$ with horizontal from the top of a building $40 \,m$ high. Then the horizontal range of projectile is ........... $m$

213004-q

  • A

    $20 \sqrt{3}$

  • B

    $40 \sqrt{3}$

  • C

    $40$

  • D

    $20$

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$(c)$ the distance from the thrower to the point where the ball returns to the same level

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