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Question

A frictionless track 12345 ends in a circular loop of radius R. A body slids down the track from point 1 Which is 6 cm. Maximum value of R for the body to successfully complete the loop is

  1. 6 CM
  2. 15/4 CM
  3. 5/12 cm    
  4. 12/5 cm    

The correct answer is: 12/5 cm

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