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Kinetic Energy and Work Homework Help

  1. Mar 12, 2013 #1
    1. The problem statement, all variables and given/known data

    While merging onto a freeway, a 1900 kg car accelerates from 17 m/s to 33 m/s

    What power did the engine supply?

    W = 7.6 x 105 J
    F = 9500 N

    2. Relevant equations

    P=W/T

    3. The attempt at a solution

    Not sure how to find T.
     
    Last edited by a moderator: Mar 12, 2013
  2. jcsd
  3. Mar 12, 2013 #2

    berkeman

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    Staff: Mentor

    Is that the whole problem statement? Are you sure it didn't ask for the average power?
     
  4. Mar 12, 2013 #3
    the previous questions were

    a)

    how much work was done?

    which i found out was 7.6 x 105

    b) If the velocity change took 80m of road what average force did the cars energy supply?

    which i found out was 9500 N

    that was all that was given to me
     
  5. Mar 12, 2013 #4

    berkeman

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    Staff: Mentor

    You left the 80m distance out of your original post. That is the piece of information that you need to figure out how long it took the car to accelerate from v1 to v2 in 80m distance...
     
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