1. PF Contest - Win "Conquering the Physics GRE" book! Click Here to Enter
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

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

    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?
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook