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: What is the average acceleration of a car

  1. Oct 27, 2003 #1
    what is the average acceleration of a car that goes from rest to 59 km h in 9.0 seconds?
    Last edited by a moderator: Feb 6, 2013
  2. jcsd
  3. Oct 27, 2003 #2


    User Avatar
    Staff Emeritus
    Science Advisor
    Gold Member

    acceleration is definined to be change in velocity per unit time.

    What is your change in velocity?

    What is your change in time?

    Can you take it from there?
  4. Oct 27, 2003 #3
    First convert 59 Km/h into m/s:

    59 * 1000 / 3600 (seconds in an hour) (m in a Km)

    59 / 3.6 = 16.4 m/s

    Then use the constant acceleration formula:

    v = u + at
    16.4 = 0 + a*9.0
    a = 16.4/9.0
    a = 1.82 m/s2
  5. Oct 27, 2003 #4


    User Avatar

    Staff: Mentor

    Generally, lavalamp, we lead them in the right direction and then let them figure it out from there. Thats the way their teachers would want it.
  6. Oct 27, 2003 #5
    Oops, I'll try and remember that in future. :frown:
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook