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Homework Help: Easy Velocity Time Graph Help

  1. Oct 2, 2008 #1
    Hello everybody, I have a small question I need help with.

    1. The problem statement, all variables and given/known data

    Draw a sketch graph of the following:

    "A car wich is travelling at 15 ms-1. At t (time) = 0, the driver sees a pedestrian step out into the road. The driver takes 0.7 seconds to apply the brakes, and the brakes produce an acceleration of -6ms-2, bringing the car to a rest."

    Use the stetch graph to calculate the stopping distance.

    2. Relevant equations

    None.

    3. The attempt at a solution

    None. Can somebody give me an example of what the graph would look like and how I would calculate the stopping distance. I take it this would be the displacement, or area under the line on the graph.

    Thanks everyone.
     
  2. jcsd
  3. Oct 2, 2008 #2

    tiny-tim

    User Avatar
    Science Advisor
    Homework Helper

    Hello getfirefox! :smile:

    You should plot speed against time.

    Constant speed is a horizontal line.

    Constant deceleration is a straight line sloping down.

    And yes, the stopping distance will be the area under the line. :smile:
     
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