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!

Homework Help: Very tricky question

  1. Sep 23, 2010 #1
    Very tricky question!!!!

    Help me try to figure out this problem please!! :(

    I was driving along at 21 m/s , trying to change a CD and not watching where I was going. When I looked up, I found myself 44 m from a railroad crossing. And wouldn't you know it, a train moving at 29 m/s was only 56 m from the crossing. In a split second, I realized that the train was going to beat me to the crossing and that I didn't have enough distance to stop. My only hope was to accelerate enough to cross the tracks before the train arrived. If my reaction time before starting to accelerate was 0.42 s , what minimum acceleration did my car need for me to be here today writing these words?
  2. jcsd
  3. Sep 23, 2010 #2
    Re: Very tricky question!!!!

    What was your attempt to the question?
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook