Physical science

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An object is projected vertically upwards and returns to the point of projection 12s later. Ignore air resistance and determine the velocity with which it was projected?

  • Physical science -

    Vf=Vi +at
    Vf=0, Vi=?, a=-9.8 remeber time taken to go up is equal to the time taken to go back to the point of projectile.. THEREFORE t=6

    Vf=Vi +at
    (0)=Vi +(-9.8)(6)
    Vi=58.8m/s

    ***[OR]***

    Vf=Vi +at
    Vf=-Vi, Vi=?, a=-9.8, t=12
    (-Vi)=Vi +(-9.8)(12)
    -2Vi= -117.6
    Vi=58.8m/s

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  • Physical science -

    It corect

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