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Homework Help: Basic force question(should be too easy)

  1. Apr 5, 2008 #1
    1. The problem statement, all variables and given/known data
    A supertanker of mass 1.0 X 10^8 travels 3.5km, reaching a speed of 4.1km/h from rest. What was the magnitude of the unbalanced force acting on it?

    2. The attempt at a solution

    I got the acceleration(2.4m/s^2), but how do I fit this into the equation? The answer is 18529.5N, but I have no idea how they got that.
  2. jcsd
  3. Apr 5, 2008 #2
    [tex]W=\Delta KE[/tex]
  4. Apr 5, 2008 #3
    Ive only taken physics for 2 months in my life, so please excuse me, but what the heck is W and what the heck is KE?
  5. Apr 5, 2008 #4
    W is work, KE is the kinetic energy.
  6. Apr 5, 2008 #5
    Im not used to using that formula. I usually use force=mass X acceleration.
  7. Apr 5, 2008 #6
    Well, your acceleration is wrong, possibly due to the fact you forgot to convert units.
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