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Question

A particle of mass m moving with velocity u makes an elastic one dimensional collision with a stationary particle of mass m. They are in contact for a very short time T. Their force of interaction increases from zero to F0 linearly in time T/2, and decreases linearly to zero in further time T/2. The magnitude of F0 is :

  1. mu/T    
  2. 2 mu/T    
  3. mu/2T    
  4. None of these    

The correct answer is: 2 mu/T

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