1. Not finding help here? Sign up for a free 30min 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!

Finding position at 8 seconds

  1. Sep 12, 2010 #1
    1. The problem statement, all variables and given/known data

    I have put the diagram in an attachment. I need to find position at 8 seconds.


    2. Relevant equations

    X = ½ at² + vt + x

    3. The attempt at a solution

    -34m + (-3m/s)(8.0s)+ ½ (-4.0m/s2)(1.0s)2 = -165 meters
     

    Attached Files:

  2. jcsd
  3. Sep 13, 2010 #2

    rl.bhat

    User Avatar
    Homework Helper

    You have to find the position and the velocity at the end of 2 s and then find position at the end of 8 seconds. ( i.e. in the remaining 6 s.)
     
  4. Sep 13, 2010 #3
    How would I go upon doing that? A couple of people told me to use two equations
     
  5. Sep 13, 2010 #4

    rl.bhat

    User Avatar
    Homework Helper

    Up to 2 s,

    x1 = xo + vo*t1 + 1/2*a*t1^2

    v1 = vo + a1t1

    For remaining 6 s,

    x2 = x1 + v1*t2 + 1/2*a2*t2^2
     
  6. Sep 13, 2010 #5
    hmmmm this is what i just did for x2

    x2= (-42m) + (-4m/s)(6.0s)+ 1/2(-4.0m/s^2)(6.0s)^2 = -66m + (-72m) = -138m

    It still gives me a wrong answer...can you explain where i went wrong?
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook




Similar Discussions: Finding position at 8 seconds
  1. Find the Position (Replies: 3)

Loading...