NEET 2016 Physics question

Physics Work, Energy and Power NEET 2016

What is the minimum velocity with which a body of mass must enter a vertical loop of radius so that it can complete the loop?

(1)
(2)
(3)
(4)Correct

Answer: (4)

Solution

To just complete the loop, the body must keep contact at the top, where the normal force vanishes: . Conserve energy between the bottom

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Question ID VK-091862