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Velocity from Kinetic energy and work energy theorem

  1. Oct 17, 2009 #1
    1. A 0.066 kg arrow is fired horizontally. The bowstring exerts an average force of 50 N on the arrow over a distance of 0.95 m. With what speed does the arrow leave the bow?


    2. Work Energy Theorem = change in kinetic energy = (1/2*mass*Final Velocity^2)-(1/2*mass*Initial Velocity^2)



    3. Since the initial speed is zero and the mass is given, I get a solution of 0, but that is most likely because I did the algebra wrong. I got an equation of Final Velocity = Square root (2*.066kg*0m/s)/(2*.066)

    Which is clearly wrong. Where did I go wrong?
     
  2. jcsd
  3. Oct 17, 2009 #2

    rl.bhat

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    Homework Helper

    What is the work done on the arrow?
    Equate it to the kinetic energy of the arrow and find the velocity.
     
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