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2d kinematics

  1. Sep 20, 2009 #1
    1. The problem statement, all variables and given/known data:
    A police car is in pursuit of a stolen pickup truck. At one instant, the car has a speed of 34m/s and is 164m behind the truck. At the same time, the truck has a speed of 32m/s. If neither vehicle accelerates, how long will it take the police to catch up to the truck?


    2. Relevant equations:
    Δy=vit+1/2at^2

    3. The attempt at a solution
    i used this equation but got the answer wrong alot of times. i dont understand any questions of this nature.
     
  2. jcsd
  3. Sep 20, 2009 #2
    You're using the wrong equation, use the definition for average speed instead
     
  4. Sep 20, 2009 #3
    Δsp=Δd/Δt

    so i get 34-32=164/t
    so t equals 82 seconds?
     
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