Question

A metal ball tied to a string is rotated in a vertical circle of radius d. For the thread to remain just tightened the minimum velocity at highest point will be

(A) \(\sqrt{5gd}\) 

(B) gd

(C) \(\sqrt{3gd}\) 

(D) \(\sqrt{gd}\) 

Answer 1

Correct option is (D) \(\sqrt{gd}\)