2d kinematics

  • Thread starter karkrash
  • Start date
  • #1
karkrash
3
0
1. Homework Statement :
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. Homework Equations :
Δy=vit+1/2at^2

3. The Attempt at a Solution
i used this equation but got the answer wrong a lot of times. i don't understand any questions of this nature.
 

Answers and Replies

  • #2
Anden
76
0
You're using the wrong equation, use the definition for average speed instead
 
  • #3
karkrash
3
0
Δsp=Δd/Δt

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

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