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General
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Question

A spring block system is placed on a rough horizontal surface having coefficient of friction mu. The spring is given initial elongation fraction numerator 3 mu m g over denominator k end fraction and the block is released from rest. For the subsequent motion

  1. Initial acceleration of block is 2 mu g    
  2. Maximum compression in spring is fraction numerator mu m g over denominator k end fraction    
  3. Minimum compression in spring is zero    
  4. Maximum speed of the block is 2 mu g square root of fraction numerator m over denominator k end fraction end root    

The correct answer is: Maximum speed of the block is 2 mu g square root of fraction numerator m over denominator k end fraction end root

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