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Find a magnitude of the force

  1. Apr 18, 2010 #1
    A block with a weight of 3.0 N is at rest on a horizontal surface. A 0.9 N upward force is applied to the block by means of attached vertical string.
    (a) What is the magnitude of the force of the block on the horizontal surface?
     
  2. jcsd
  3. Apr 18, 2010 #2
    You must show an attempt before we can help you.
     
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