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JEE Advanced2008PhysicsMotion in Two DimensionsActual

A bob of mass M is suspended by a massless string of length L . The horizontal velocity v at position A is just sufficient to make it reach the point B . The angle at which the speed of the bob is half of that at A , satisfies

Options

  1. A= 4
  2. B4 < < 2
  3. C2 < < 3 4
  4. D3 4 < <

Correct answer

D. 3 4 < <

Step-by-step solution

v= 5 g L Solving Eqs. (i), (ii) and (iii) we get, =- 7 8 or = ⁻¹ (- 7 8 )=151^ correct option is (d).

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