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Kinematics Problem

  1. Jan 30, 2012 #1
    1. The problem statement, all variables and given/known data

    In an emergency braking exercise, a student driver stops a car travelling at 83 km/h [W] in a time of 4.0 s. What is the car's acceleration during this time?

    2. Relevant equations



    3. The attempt at a solution

    a = (v2-v1)/t
    = 83/4
    = 21 m/(s^2) [E]
     
  2. jcsd
  3. Jan 30, 2012 #2

    tiny-tim

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    hi tahayassen! :smile:

    erm :redface:

    km/h :wink:
     
  4. Jan 30, 2012 #3
    Oh... What a dumb mistake. I'm looking at old tests that I've written, and I'm trying to see my mistakes for the upcoming exam!
     
  5. Jan 30, 2012 #4

    tiny-tim

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    yeah, exam questions can be sneaky :yuck: …

    always check the units! :smile:
     
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