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Two smooth spheres, A&B, of equal radius, lie on a horizontal table. A is of mass m, & is of mass 3m. The spheres are projected towards each other with velocity vectors 5 stack i with ˆ on top plus 2 stack j with ˆ on top and 2 i with not stretchy hat on top minus j with not stretchy hat on top respectively & when they collide the line joining their centres is parallel to the vector i. If the coefficient of restitution between A and B is fraction numerator 1 over denominator 3 end fraction The magnitude of the impulse that act at the instant of impact is.

  1. 4 m    
  2. 3 m    
  3. 2 m    
  4. m    

The correct answer is: 3 m

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