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!

Grade 11 U Kinematics

  1. Oct 13, 2009 #1
    Hey, guys just joined PF, was hoping you could help with this questions and in turn maybe i can return the favour (with the little physics knowledge I have).

    1. The problem statement, all variables and given/known data
    In a acceleration test, 2 markers are placed 0.30 km apart. The first car passed the first marked with a velocity of 5.0 m/s [E], the second passed the marker with a velocity of 33.0 m/s [E]. Calculate the Cars average acceleration.


    2. Relevant equations
    v1 = 5.0 m/s [E]
    v2 = 33 m/s [E]
    Delta D = 0.30 km
    Aav = ?

    The kinematics that i am using is Vf² = Vi² + 2aav(d)
    3. The attempt at a solution
    The problem i am having is rewriting the equation.
    I need to rewrite this for aav.

    Vf² - Vi² = Vi² + 2aav(d)

    vf² - vi²/2(d) = aav

    This is what i have so far, but it must be wrong i just dont see how. When i plug in the numbers..

    1089 - 25/2(0.3) = aav
    1064/0.6 = aav
    aav = 1773.3

    this cant be right can anyone help me?
     
  2. jcsd
  3. Oct 13, 2009 #2

    rl.bhat

    User Avatar
    Homework Helper

    Hi CraZyFanAtic, welcome to PF.
    Convert the distance from kilometer to meter.
     
  4. Oct 13, 2009 #3
    O, wow do i feel stupid. First time ive seen a question like that just didn't think about it, thanks alot. Saved me alot of time.
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook




Similar Discussions: Grade 11 U Kinematics
Loading...