Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Homework Help: Relative velocity and car

  1. Oct 2, 2011 #1
    1. The problem statement, all variables and given/known data

    Car A is traveling east at 20m/s toward the intersection, car B from rest 40 m North of the intersection and moves south steadily gaining speed at 2.0 m/s^2. six second after A crosses the intersection find 1) position of B relative to A 2) the velocity of B relative to A, C) the acceleration of B relative to A....(it should include unit vector i and j)

    2. Relevant equations
    none


    3. The attempt at a solution
    I got the ans for A)
    r=(120 m)i + (4.0 m) j
    but can't find the rest of it
     
  2. jcsd
  3. Oct 2, 2011 #2
    Alright, when considering "relative" speed, remember that it means that you are pretending that car A is completely stopped. As such, what do you need to do with its velocity and acceleration?
     
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook