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Math Help - projectiles equation confusion

  1. #1
    Junior Member silvercats's Avatar
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    projectiles equation confusion

    there are two equations v=u+at and s=ut+(1/2)atē
    from the first question ,if we set the time to v=0 to find time(t)(which is half of the flying time),
    we get
    0=u-(g/2)t
    (g/2)t=u
    t=2u/g ----- (1) to find the total,we have to multiply by 2. so t=4u/g
    when the displacement is 0,we can find the total flying time using:
    s=ut+(1/2)atē
    0=ut-(g/2)tē
    t{u-(g/2)t}=0
    (g/2)t=u or t=0
    t=2u/g ,not 4u/g

    aren't both equations suppose to give the same answer?
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  2. #2
    Junior Member silvercats's Avatar
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    NEVER MIND.Problem is solved! .how to mark this as solved?
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  3. #3
    Behold, the power of SARDINES!
    TheEmptySet's Avatar
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    In the upper right of your first post click on thread tools. Mark as solved should be one of the choices.
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  4. #4
    Junior Member silvercats's Avatar
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    ah ok,thanks
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