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Homework Help: Physics question!

  1. Oct 25, 2006 #1
    A 0.42 kg ball is moving horizontally with a speed of 5.5 m/s when it strikes a vertical wall. The ball rebounds with a speed of 2.0 m/s. What is the magnitude of the change in linear momentum of the ball?

    Might seem like a simple problem, but everytime i input an answer into it, it says im wrong, can neone help?
     
  2. jcsd
  3. Oct 25, 2006 #2

    radou

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    Homework Helper

    Since the change in linear momentum is a vector given by (mv2-mv1)i, its magnitude is the square root of (mv2-mv1)^2, which equals mv2-mv1. This should work.
     
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