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Calculating Work

  1. Oct 21, 2016 #1
    1. The problem statement, all variables and given/known data
    calculate work when mass of car is 2400kg and displacement is 200m the car travels at velocity of 26.5m/s then speeds up to 30m/s
    2. Relevant equations
    M- 2400 kg
    Vi - 26.5m/s
    Vf- 30 m/s
    D- 200 m

    3. The attempt at a solution
    I am struggling with figuring out how to solve this problem would i have to use the formula w = Ek - Ek? But theb i dont end up usinh displacement is there no need to use it here? Does the question have too much information given?
  2. jcsd
  3. Oct 21, 2016 #2


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    What do you think and why?
  4. Oct 21, 2016 #3


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    There are two ways to solve the problem and both give the same answer.
  5. Oct 21, 2016 #4
    I think that yes u can solve without displacement. Thats the way i make sense of the question Ek final minus Ek initial!
  6. Oct 21, 2016 #5
    use ##W = {1\over 2}m(v_f^2 - v_i^2)##
  7. Oct 21, 2016 #6


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    You can also solve it by using the displacement and the equations of motion to calculate the acceleration. Then apply Newtons law to give the force. Then work = force * distance. Gives same answer as calculating the change in KE.
  8. Oct 21, 2016 #7


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    Have you quoted the whole question, word for word? It reads a bit strangely.
    If so then I applaud the question setter. It should happen much more often that questions include redundant information. Figuring out which information is useful is a necessary skill in the real world.
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