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Question

One end of a light rod of length 1 m is attached with a string of length 1m. Other end of the rod is attached at point O such that rod can move in a vertical circle. Other end of the string is attached with a block of mass 2kg. The minimum velocity that must be given to the block in horizontal direction so that it can complete the vertical circle is (g = 10 m/s2 )

  1. 4 square root of 5    
  2. 5 square root of 5    
  3. 10    
  4. 3 square root of 5    

The correct answer is: 5 square root of 5

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