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One dimensional kinematics

  1. Apr 5, 2009 #1
    1. The problem statement, all variables and given/known data
    "A race car driver must average 180 km/h for 4 laps to qualify for a race. Because of engine trouble, the car averages only 150 km/h over the first 2 laps. What speed must be maintained for the last 2 laps?"

    2. Relevant equations

    v= d/t

    3. The attempt at a solution
    i actually have no idea where to start with this
  2. jcsd
  3. Apr 5, 2009 #2


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    Homework Helper

    Find total time for 4 laps with average velocity 180 km/h.
    Find total time for 2 laps with average velocity 150 km/h.
    Find total time for remaining 2 laps with average velocity v km/h.
    Equate the first one with the sum of the other two.
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