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Work done in time

  1. Nov 14, 2009 #1
    1. The problem statement, all variables and given/known data
    a 1.83x10^3 kg car accelerates uniformly from rest to 13.6m/s in 2.81 s

    -what is the work done on the car in this time inerval?

    -what is the power delivered by the engine in thsi time interval?



    2. Relevant equations

    w=f*d
    p=w/t

    3. The attempt at a solution

    i did the first one, but could not be able to come up with the answer
    i multiplied gravity x mass = f then fxd=246568 and its wrong
    can you please explain or tell me how to get it
     
  2. jcsd
  3. Nov 15, 2009 #2
    Because your acceleration is not gravity, it is the acceleration that is implied in the problem:

    [tex]
    a=\frac{v_f-v_0}{t}=\frac{13.6m/s-0m/s}{2.81s}=4.84m/s^2
    [/tex]
     
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