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Homework Help: Work problem

  1. Jun 15, 2010 #1
    1. The problem statement, all variables and given/known data
    a 4kg projectile is fired on earth with intiial velocity 40m/s at an angle of 30 degrees to the horizontal. what work was done in firing the projectile?


    2. Relevant equations



    3. The attempt at a solution
    I got 5542 J. Answer is suppsoedly 3200J
     
  2. jcsd
  3. Jun 15, 2010 #2

    rock.freak667

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    Homework Helper

    The work done is the change in kinetic energy. The mass goes from 0 to 40 m/s. So the change in kinetic energy is?
     
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