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Homework Help: Work and Kenetic Energy

  1. Apr 20, 2008 #1
    1. A 4.00 kg block is traveling 15.0 m/s. (a) How fast is the block traveling if 2.00 x 10^2 J of work is done on the block? (b) If -2.00 x 10^2 of work is done on the block instead, what would be the final speed?

    2. Relevant equations
    KE = 1/2mv^2

    3. The attempt at a solution
    a KE = 4.5 x 10^2 + 2.0 x 10^2
    b 4.5 x 10^2 J - 2.0 X 10^2
  2. jcsd
  3. Apr 20, 2008 #2


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    Homework Helper
    Gold Member

    What is your question?

    Also, the Advanced Physics forum is more for problems from upper level undergraduate (300-400 level) physics course. Please post problems like these in the Intro Physics Forum.
  4. Apr 21, 2008 #3
    Well I got the question wrong with the work that I did, so I waned to know what I did wrong.
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