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What is the average force exerted by the ball on the wall

  1. Oct 27, 2008 #1
    A 425 g ball with a speed v of 6.5 m/s strikes a wall at an angle of 30° and then rebounds with the same speed and angle. It is in contact with the wall for 9.0ms. (a) What is the impulse on the ball (take positive as down in the figure)?


    b. What is the average force exerted by the ball on the wall (take positive as down in the figure)?


    hmmm, I think i had it. I used

    vi = v cos θˆi − v sin θˆj
    vf = v cos θˆi +v sin θˆj

    J = mvf − mvi

    But I am still getting it wrong. Any help is helpful. Thanks
     
  2. jcsd
  3. Oct 27, 2008 #2
    Re: Impulse

    find the acceleration vector from the inital and final velocity vectors and the change in time.

    Plug that into F = ma

    you now have the force.

    Solve for Impulse using the same method.
     
  4. Oct 27, 2008 #3
    Re: Impulse

    vf - vi / t = a


    I did that and didn't get it right when I plugged it into F= ma.
     
  5. Oct 28, 2008 #4
    Re: Impulse

    you want to break the vector velocities into components
     
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