A 100 g object is moving in a vertical circle. At the TOP of the loop, for minimum speed (string just slack), v_min equals:
A√(rg)
B√(2rg)
C√(rg/2)
DZero
Answer & Solution
Correct answer: A. √(rg)
At top of vertical loop, minimum speed when gravity alone provides centripetal force: mg = mv²/r → v_min = √(rg). Below this, the string goes slack and circular motion breaks.
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