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Homework Help: Quick Question - Conservation of Momentum

  1. Oct 3, 2005 #1
    ball with a mass of 0.10 kg has a velocity of 7 m/s. It strikes a concrete wall perpendicularly and bounces straight back with velocity of 4 m/s. The change in the ball's momentum was equal to

    Response Answer Choices
    a. 0.30 kg m/s
    b. 0.10 kg m/s
    c. 0.40 kg m/s
    d. 1.1 kg m/s

    0.1 x 7 and .4 x .1 = .7 and .4 and subtracting them gives .30 kg m/s, correct?
  2. jcsd
  3. Oct 3, 2005 #2
    Nevermind, I found the answer (1.1). Silly mistake.
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