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Question

In the figure shown, the two identical balls of mass M and radius R each, are placed in contact with each other on the frictionless horizontal surface. The third ball of mass M and radius R/2, is coming down vertically and has a velocity = v0 when it simultaneously hits the two balls and itself comes to rest. Then, each of the two bigger balls will move after collision with a speed equal to

  1. 4 v subscript 0 end subscript divided by square root of 5    
  2. 2 v subscript 0 end subscript divided by square root of 5    
  3. v subscript 0 end subscript divided by square root of 5    
  4. None    

The correct answer is: v subscript 0 end subscript divided by square root of 5

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