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MHT CET2018PhysicsMotion in Two Dimensions

A mass attached to one end of a string crosses topmost point on a vertical circle with critical speed. Its centripetal acceleration when string becomes horizontal will be ( g = gravitational acceleration)

Options

  1. Ag
  2. B3 g
  3. C4 g
  4. D6 g

Correct answer

B. 3 g

Step-by-step solution

Critical velocity at top most point v = r g ∴ Velocity when string become horizontal v ' = υ 2 + 2 g r = 3 g r Centripetal acceleration = υ 2 r = 3 r g r = 3 g

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