1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    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!

What equation could I use for this?

  1. Sep 27, 2011 #1
    1. The problem statement, all variables and given/known data

    Two particles are at the same point at the same time, moving in the same direction. Particle A has an initial velocity of 6.9 m/s and an acceleration of 1.8 m/s2. Particle B has an
    initial velocity of 2.4 m/s and an acceleration of 5.7 m/s2.

    At what time will B pass A?

    2. Relevant equations

    [itex]\Delta[/itex]x = vit + 1/2at2

    3. The attempt at a solution

    I'm just wondering what equation I should use for this. I think I need to set up a system, but I don't see why I would need displacement for this. The only information the question gives us is vi for both, the acceleration for both, and the fact that they're going the same direction.

    I really don't understand how I would go about solving it. Knowing the equation(s) to use would be a great start!

    I'm really discouraged. I just tried setting two equations equal and I got the wrong answer... I don't know what to do.

    Thank you so much!

    EDIT: I calculated with the quadratic equation wrong somehow, but found the answer.
     
    Last edited: Sep 27, 2011
  2. jcsd
  3. Sep 27, 2011 #2

    SammyS

    User Avatar
    Staff Emeritus
    Science Advisor
    Homework Helper
    Gold Member

    One more piece of information.

    When B passes A, they're at the same location.
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook




Similar Discussions: What equation could I use for this?
Loading...