Question : A bob of mass M is suspended by a massless string of length L. The horizontal velocity π£ at position A is just sufficient to make it reach the point B. The angle π at which the speed of the bob is half of that at A, satisfies
(A) \theta =\dfrac{\pi }{4}
(B) \dfrac{\pi }{4} <\theta <\dfrac{\pi }{2}
(C) \dfrac{\pi }{4} <\theta <\dfrac{3\pi }{2}
(D) \dfrac{3\pi }{4} <\theta <\pi
Answer : option (D)
Solution :

