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!

Constant acceleration in a straight line with variable distances

  1. May 8, 2013 #1
    1. The problem statement, all variables and given/known data

    A particle which moves with a constant acceleration in a straight line passes through the point O, A and B in that order. If the distances OA and AB are 17 m and 35 m respectively and the particle takes the same amount of time , 3 seconds to travel each distance then calculate

    i)acceleration

    ii) the time taken to travel 105 m from O



    2. Relevant equations
    s = ut + .5at^2


    3. The attempt at a solution

    i figured out the acceleration. the second part is giving me trouble
     
  2. jcsd
  3. May 8, 2013 #2

    haruspex

    User Avatar
    Science Advisor
    Homework Helper
    Gold Member
    2016 Award

    What did you get for a? Did you also calculate u at O?
     
  4. May 8, 2013 #3
    no i didnt get u. i got a to be 2ms^-2
     
  5. May 8, 2013 #4

    haruspex

    User Avatar
    Science Advisor
    Homework Helper
    Gold Member
    2016 Award

    Yes, that's right for a. If you now calculate u at O, can you see how to finish the question?
     
  6. May 9, 2013 #5
    how do i go about calculating u at O? can u explain to me?
     
  7. May 9, 2013 #6

    haruspex

    User Avatar
    Science Advisor
    Homework Helper
    Gold Member
    2016 Award

    Well, how did you calculate a? The equation you quoted has a u in it.
     
  8. May 9, 2013 #7
    yeah i do but i dont know how to go about finding u at O can you explain to me how?
     
  9. May 9, 2013 #8

    haruspex

    User Avatar
    Science Advisor
    Homework Helper
    Gold Member
    2016 Award

    please post your working for how you calculated a.
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?
Draft saved Draft deleted