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A block rests on a rough inclined plane making an angle  30 to the power of ring operatorof  with the horizontal. The coefficient of static friction between the block and the plane is 0.8. If the frictional force on the block is 10 N, the mass of the block (in kg) is : open parentheses text  taken  end text g equals 10 ms squared close parentheses

  1. 2.0
  2. 4.0
  3. 1.6
  4. 2.5

The correct answer is: 2.0

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