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!

Two particles

  1. Sep 30, 2010 #1
    if particles A and B are at sepration of distance d and both start moving simultaniously with speed v and u , such that dir. of velocity of A always points towords the position of B and given that v>u , then to catch B , will A have to travell a distance of d irrespective of the direction of motion of b ?????????? and why?????????????????????????????????
    (given that they do nt move towards each other)
  2. jcsd
  3. Sep 30, 2010 #2
    You say irrespective of the direction of motion of B... but if B is moving towards A, then A will only cover a fraction of the distance d before it meets B coming toward it.

    If B is moving away, then A will have to cover a distance greater than d to reach it.

    The only way A will only have to cover distance d is if B isn't moving at all.
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook