alleryStart learning →For a mass on a string in a vertical circle, the minimum speed at the top for the string to stay taut is
A√(rg)
B√(2rg)
C√(3rg)
D√(5rg)
Answer & Solution
Correct answer: A. √(rg)
At the top mg alone must supply the centripetal force, so mv²/r = mg and v = √(rg).
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