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: Finding how long it takes given changing acceleration

  1. Sep 13, 2007 #1


    User Avatar

    1. The problem statement, all variables and given/known data
    At highway speeds, a particular automobile is capable of an acceleration of about 1.57 m/s2. At this rate, how long does it take to accelerate from 72.0 km/hr to 100.0 km/hr?

    2. Relevant equations

    I was given: vf = vi + at

    3. The attempt at a solution

    Simplifying the velocities I got 28 = 1.57a
    and a= 17.83 s.
  2. jcsd
  3. Sep 13, 2007 #2


    User Avatar
    Homework Helper

    careful about units... convert km/hr to m/s or convert m/s^2 to km/hr^2...
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook