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Question

A 2 Kg block moving with 10 m/s strikes a spring of constant pi to the power of 2 end exponentN/m attached to 2 Kg block at rest kept on a smooth floor. The time for which rear moving block remain in contact with spring will be

  1. square root of 2 blanksec    
  2. fraction numerator 1 over denominator square root of 2 end fractionsec    
  3. 1 sec    
  4. fraction numerator 1 over denominator 2 end fractionsec    

The correct answer is: 1 sec

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