A small spherical ball is suspended through a string of length \( l \). The whole arrangement is....

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A small spherical ball is suspended through a string of length \( l \). The whole arrangement is placed in a vehicle which is moving with velocity \( v \). Now, suddenly the vehicle stops and ball starts moving along a circular path. If tension in the string at the highest point is twice the weight of the ball then (assume that the ball completes the vertical circle)
(A) \( v=\sqrt{5 g l} \)
(B) \( v=\sqrt{7 g l} \)
(C) velocity of the ball at highest point is \( \sqrt{g l} \)
(D) velocity of the ball at the highest point is \( \sqrt{3 g l} \)


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