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Circular Motion: Vertical Circle — Minimum Speed at Top MCQ

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Vertical Circle — Minimum Speed at TopMediumQuestion 30611

Question

Minimum speed at the top of a vertical circle (radius r) for a string to remain taut is:
  1. A
    0
  2. B
    √(gr/2)
  3. C
    √(gr)
    Correct
  4. D
    √(2gr)

Correct answer

√(gr)

Explanation

At the top, for minimum speed: T = 0. Then mg = mv²/r → v_min = √(gr).

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