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Basic Physics Question

  1. Sep 13, 2006 #1
    I don't understand this:

    A slow car moves at a steady 10 km/hr down a straight highway while another car zooms past at a steady 120 km/hr. Which car is has the greater net force on it?

    The answer is neither, because the net force on each car is zero.

    Why is it zero???
     
  2. jcsd
  3. Sep 13, 2006 #2
    Look at the definition of force.
     
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