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A given object takes n times more lime to slide down 450  roagh inclin a practly smooth  incline. The cofficient of kinetic function between the object and the incline is

  1. fraction numerator 1 over denominator 2 minus n squared end fraction
  2. 1 minus 1 over n squared
  3. square root of 1 minus 1 over l squared end root
  4. square root of fraction numerator I over denominator I minus n squared end fraction end root

The correct answer is: 1 minus 1 over n squared

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