Transportation-Find Initial Velocity Using Kinematic Equations

[@AL-ho9yd]

see pg 270 in PE reference manual (as of 2022) estimating vehicle speed from skid marks

[@vincentaroux]

FYI, this is Transpo DEPTH content, not civil breadth, per 1/1/2022 CBT exam specs - accident analysis

[@sedziobs]

I find it easier to use this equation, a modified form of Eq 75.25b in the CERM:
Sb=(Vo^2-Vf^2)/[30(f+G)]
It was still useful to have a kinematics refresher though. Thanks for the videos.

[@CivilEngAcademy]

sedziobs Good check on finding a faster way. There can definitely be more than one way to attack a problem. Thanks!

[@GeorgeFoutris]

+sedziobs Good call on that. Thanks!

[@LionRiver]

This is also the equation I used to solve the problem. Apparently V in that equation should be (mph). units seem to be already accounted for.

[@eddoct]

But using equation 75.25b gave me 63.20 which would closer to answer b. Am I splitting hairs? Or did I miss something?

[@trasotraso]

what would change if the car was travelling uphill instead of downhill?

[@hassan1854]

nice one

[@CivilEngAcademy]

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Transportation-Find Initial Velocity Using Kinematic Equations