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Kinetic friction hw

  1. Sep 25, 2011 #1
    i feel really dumb but i have this physics homework question i cant get.

    a 20kg sled is being pulled across a horizontal surface at constant velocity. the pulling force has a magnitude of 80N at a 30 degree angle above the horizontal. find the coefficient of kinetic friction.
     
  2. jcsd
  3. Sep 25, 2011 #2
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