Question : A body slides down a frictionless track which ends in a circular loop of diameter 𝐷. Then the minimum height ℎ of the body in terms of 𝐷 so that it may just complete the loop, is
(A) h=\dfrac{5}{2}D
(B) h=\dfrac{3}{2}D
(C) h=\dfrac{5}{4}D
(D) ℎ = 2D
Answer : option (C)
Solution :
