A stone of mass 1 kg tied to a light inextensible string of length L = (10/3) metre is whirling in a circular path of radius L in a vertical plane …

Q: A stone of mass 1 kg tied to a light inextensible string of length L = (10/3) metre is whirling in a circular path of radius L in a vertical plane. If the ratio of the maximum tension in the string to the minimum tension is 4 and if g is taken to be 10 m/s2. The speed of the stone at the highest point of the circle is

(a) 20 m/s

(b) 10√3 m/s

(c) 5 √2 m/s

(d) 10 m/s