A particle is projected from ground with speed $80 \,m / s$ at angle $30^{\circ}$ with horizontal from ground. The magnitude of average velocity of particle in time interval $t=2 \,s$ to $t=6 \,s$ is ....... $m / s$ [Take $g=10 \,m / s ^2$ ]

  • A

    $40 \sqrt{2}$

  • B

    $40$

  • C

    $0$

  • D

    $40 \sqrt{3}$

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