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Question

A mass is tied to a string and rotated in a vertical circle. What should be the minimum velocity of the body at the top such that the string remains taut?
  1. gr
  2. g/r
  3. (gr)3/2
  4. gr

A
gr
B
(gr)3/2
C
g/r
D
gr
Solution
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Let velocity at A=vA and velocity at B=vB
Applying conservation of energy at A and B

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