Question : In a loop-the-loop, a body starts at a height β = 2π . The minimum speed with which the body must be pushed down initially in order that it may be able to complete the vertical circle is
(A) \sqrt{2gR}
(B) \sqrt{gR}
(C) \sqrt{3gR}
(D) 2\sqrt{gR}
Answer : option (B)
Solution :
