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PLEASE HELP How long will it take until the car's speed drops to 12.0 m/s?

  1. Sep 29, 2008 #1
    1. The problem statement, all variables and given/known data
    A 1.54 m wide, 1.48 m high, 1600 kg car hits a very slick patch of ice while going 19.0 m/s. Air resistance is not negligible.
    If friction is neglected, how long will it take until the car's speed drops to 12.0 m/s?
    To 11.0 m/s?

    2. Relevant equations
    Kinematics equations, F=ma


    3. solution
    I have no idea how to solve this :-(
    If you solve it, please explain WHY?
     
    Last edited: Sep 29, 2008
  2. jcsd
  3. Sep 29, 2008 #2
    Draw a free body diagram. What are the forces acting on the car?
     
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