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JEE Main202126 Aug 2021Evening ShiftPhysicsMotion in Two DimensionsActual

A particle of mass m is suspended from a ceiling through a string of length L . The particle moves in a horizontal circle of radius r such that r = L 2 . The speed of particle will be :

Options

  1. Ar g
  2. B2 r g
  3. Cr g 2
  4. D2 r g

Correct answer

A. r g

Step-by-step solution

sin θ = 1 2 θ = 45 ° tan θ = m v 2 r m g = v 2 r g = 1 v 2 = rg v = r g

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