A stone of mass 1 kg tied to a light inextensible string of length 10/3 metre is whirling in a vertical circle. If the ratio of maximum tension to minimum tension in the string is 4, then speed of stone st highest point of the circle is- [g = 10 m/s2]
(A) 20 m/s
(B) 10√3 m/s
(C) 5√2 m/s
(D) 10 m/s
