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Question

A solid sphere is rolling without slipping on rough ground as shown in figure. It collides elastically with an identical another sphere at rest. There is no friction between the two spheres. Radius of each sphere is R and mass is m. What is the net angular impulse imparted to second sphere by the external forces ?

  1. fraction numerator 2 over denominator 7 end fraction m R v    
  2. fraction numerator 5 over denominator 7 end fraction m R v    
  3. fraction numerator 2 over denominator 5 end fraction m R v    
  4. fraction numerator 7 over denominator 10 end fraction m R v    

The correct answer is: fraction numerator 2 over denominator 7 end fraction m R v

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