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Question 30659
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Circular Motion: JEE — Critical Speed at Top MCQ

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JEE — Critical Speed at TopMediumQuestion 30659

Question

A ball on a string of length 2 m just completes a vertical circle. Speed at the top is: (g = 10)
  1. A
    √20 m/s
    Correct
  2. B
    10 m/s
  3. C
    √10 m/s
  4. D
    20 m/s

Correct answer

√20 m/s

Explanation

v_top_min = √(gr) = √(10×2) = √20 ≈ 4.47 m/s.

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