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?

A

B

C

D

Medium

Solution

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Correct option is A)

Let velocity at and velocity at
Applying conservation of energy at and




Now as it is moving in circular path it has centripetal force.
At point  
for minimum velocity
Or

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