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Homework Help: Car Crash Physics Involving Skid Marks

  1. Jul 11, 2012 #1
    1. The problem statement, all variables and given/known data

    Two vehicles crash at an intersection
    Mass of vehicle one: 1858kg
    Mass of vehicle two: 2865Kg

    Vehicle one was headed North
    Vehicle two was headed East

    The two vehicles stuck together in a t-bone fashion and the two vehicles left the intersection stuck together, moving at an angle of [N67E].

    The vehicles left 40.0m skid marks behind.

    15.334m of skid marks were on wet asphalt with a friction coefficient of 0.8.

    24.6666m of skid marks were on dirt with a friction coefficient of 0.5.

    Determine the initial velocity (before the crash) of vehicle one.

    I am instructed to use kinematics and dynamics to solve this problem.

    2. Relevant equations

    Vf = Vi + 2ad

    Fg = mg = weight = normal force

    fk = µkFN

    3. The attempt at a solution

    I created a free body diagram but do not know how to approach the problem, any help is appreciated.
    I have also searched this website for similar answers but non applied to my problem
    Last edited: Jul 11, 2012
  2. jcsd
  3. Jul 12, 2012 #2
    *SOLVED* //Close-Thread
  4. Jul 19, 2012 #3

    Simon Bridge

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    Science Advisor
    Homework Helper

    Imagine another student has a similar problem and googles it - google shows them, amongst others, your thread. They get here, read your question and get excited: here is someone havinf the same problem!!! Then they read the next post ...
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