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Homework Help: Incomplete Momentum bar chart for collision

  1. Mar 23, 2013 #1
    1. The problem statement, all variables and given/known data
    The figure (Figure 1) is an incomplete momentum bar chart for a collision that lasts 15ms .

    Figure 1: http://session.masteringphysics.com/problemAsset/1384208/4/knight_Figure_09_06.jpg

    What is the magnitude of the average collision force exerted on the object?
    Express your answer to two significant figures and include the appropriate units.

    2. Relevant equations

    3. The attempt at a solution
    I've never seen a momentum bar chart before and we never learned anything like this in class.
    i tried -8N because 6-8=-2, but that was wrong
    How am I supposed to approach this problem?
  2. jcsd
  3. Mar 23, 2013 #2
    -8 is actually the magnitude of change in momentum. You must divide it by the time taken to get the average force.
  4. Mar 23, 2013 #3
    yes, that makes sense and it is correct.
    Thanks Sunil!
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