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Homework Help: Finding the hange in inetic energy

  1. Nov 4, 2008 #1
    1. The problem statement, all variables and given/known data
    A 1609 kg car has a speed of 11.9 m/s when it hits a tree. The tree doesn't move and the car comes to rest.
    Find the change in kinetic energy of the car. Answer in units of J.

    2. Relevant equations

    3. The attempt at a solution
    Okay so like Im not completely sure where to go here...
    I started out in finding the kinetic energy
    Any help would be super awesome.
  2. jcsd
  3. Nov 4, 2008 #2


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    Homework Helper

    OK You found the Kinetic energy for before impact.

    What is the KE after impact? What is v?

    What is the difference?
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