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Homework Help: Average force problem

  1. Nov 8, 2004 #1
    A 3.0kg steel ball strikes a massive wall at 10m/s at an angle of 60degrees with the plane of thge wall. It bounces off with the same speed and angle. If the ball is in contact with the wall for .20s, wut is the average force exerted on the ball by the wall?

    its is wut i got..
    p=mv p=mv
    3(10) =3(-10)
    =30 =-30


    averageF=deltaP/delta time
    correct or incorrect?
    can someone help me?
  2. jcsd
  3. Nov 8, 2004 #2


    User Avatar

    Yep, looks good.

    To be totally correct though, F*t is really impulse, not momentum, though they are the same magnitudes, so it really doesn't matter. But that's the kind of multiple choice question that can screw you over, so it's worth knowing.
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