Parabolic Motion, equation for t

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SUMMARY

The equation for time in parabolic motion is correctly expressed as t = (v - u) / a, where v is the final velocity, u is the initial velocity, and a is the acceleration. The discussion highlights that when the final velocity along the y-axis is zero, the user may be overlooking the need for a negative sign in the equation, indicating a downward motion. Additionally, the possibility of non-constant acceleration is raised, which could further complicate the calculation of time.

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

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