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!

Physics 12 help please

  1. Jul 4, 2010 #1
    1. The problem statement, all variables and given/known data

    a car accelerates in a straight line from rest ot a velocity of 80km/h in a time of 6s

    2. Relevant equations

    what is the acceleration of the car?
    how far did the car travel in this time?

    3. The attempt at a solution
    Now I am trying to convert 80km/h to m/s, so that equals 22.22m/s. I am doing this as an online course and I cant find a formula? Can someone help me please?
  2. jcsd
  3. Jul 5, 2010 #2
    1km/hour = 1000m/3600secs = 1/3.6m / s. This means, that to get m/s from km/hour, you just need to divide it by 3.6.
    Acceleration a = dv / dt, both of which you know.
    And as for how far did the car travel, s=(a/2)*t^2, since it's from resting. Those are the formulas you need.
  4. Jul 5, 2010 #3


    User Avatar
    Staff Emeritus
    Science Advisor
    Homework Helper

    The course does not provide any reference or study material containing formulas? Sounds like you are wasting your money, if you are paying.
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook