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Parabolic Motion, equation for t

  1. Oct 18, 2012 #1
    I'd like to know why

    t= v - u/a

    will not get me a correct value for t when v= final velocity, u= initial velocity and a=acceleration, when the final velocity of the projectile along the y axis=0.
     
  2. jcsd
  3. Oct 18, 2012 #2

    haruspex

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    I hope you mean t= (v - u)/a.
    Please show your working so that we can see where you go wrong. Are you perhaps forgetting to make a negative?
     
  4. Oct 19, 2012 #3

    mfb

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    What do you mean with "parabolic motion"?
    Maybe the acceleration is not constant?
     
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