Question

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?

A

B

C

D

Medium
NEET

Solution

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Correct option is
D

To just complete the circle, at the highest point, tension  is zero and the gravitational force provides the necessary centripetal force.
Hence,

Applying conservation of energy at the top and bottom points, 

Substituting from (i) in (ii) and solving,

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