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Work-Kinetic Energy Theorem

  1. Nov 19, 2013 #1
    1. The problem statement, all variables and given/known data
    A 2.1x103 kg car starts from rest at the top of a driveway that is cooped at an angle of 20.0° with the horizontal. An average friction force of 4.0 x 103 N impedes the car's motion so that the car's speed at the bottom of the driveway is 3.8 m/s. What is the length of the driveway.


    2. Relevant equations
    Wnet = KE

    In other words: Work = m1v1/2 - m2v2/2

    Work = force x distance


    3. The attempt at a solution

    Please give me some work along with the answer so I can understand how to complete the problem.
    1. The problem statement, all variables and given/known data



    2. Relevant equations



    3. The attempt at a solution
     
  2. jcsd
  3. Nov 19, 2013 #2

    tiny-tim

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    Hi BadCo55! Welcome to PF! :wink:

    Show us what you've tried and where you're stuck, and then we'll know how to help! :smile:
     
  4. Nov 19, 2013 #3
    That's the thing, I really don't know how to start...
     
  5. Nov 19, 2013 #4

    tiny-tim

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    start with the work-energy theorem
     
  6. Nov 19, 2013 #5
    Would it be d = -0.2625 ? Since it's frictional force I put -4.0x10^3
     
  7. Nov 20, 2013 #6

    tiny-tim

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    (just got up :zzz:)

    please show your calculations :smile:
     
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