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!

E=1/2mv^2 Given E and change in velocity

  1. Nov 26, 2016 #1
    1. The problem statement, all variables and given/known data
    It takes 185 kJ of work to accelerate a car from 23.0 m/s to 28.0 m/s. What is the car’s mass?


    2. Relevant equations
    E=1/2mv^2

    3. The attempt at a solution
    I get that I must put (2E) over V2 I am just not sure if I was allowed to put the change in velocity so it would look like this. (2E)/(V12 - V02)
    If it is correct will someone please tell me why?
     
  2. jcsd
  3. Nov 26, 2016 #2

    mfb

    User Avatar
    2016 Award

    Staff: Mentor

    Why don't you calculate it and then check the kinetic energy of the car befoere and after the velocity change?
     
  4. Nov 26, 2016 #3
    Thanks! I got the answer correct.
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?
Draft saved Draft deleted



Similar Discussions: E=1/2mv^2 Given E and change in velocity
  1. Mgh = 1/2mv^2 (Replies: 4)

  2. About Ek=1/2mv^2 (Replies: 1)

Loading...