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Homework Help: Use the 'force' but how?

  1. Oct 29, 2009 #1
    1. The problem statement, all variables and given/known data
    During a circus performance a 72 kg human cannonball is shot out of an 18m long cannon. If the human cannonball spends .95 s in the cannon, determine the average net force exerted on him in the barrel in the cannon.

    2. Relevant equations

    x=v0t + 1/2 at^2 (?)

    3. The attempt at a solution

    So i solved for acceleration using the kinematics equation, assuming that v0=0
    i got approximately 40 m/s^2 and multiplied that by the mass of the man
    I got about 2900 N. Is this a good answer? Or did I confuse myself, as usual, when it comes to physics.
  2. jcsd
  3. Oct 30, 2009 #2


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    Homework Helper

    Your solution is correct.

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