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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

    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


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    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.
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