1.

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 term of \[D\] so that it may just complete the loop, is

A.             \[h=\frac{5D}{2}\]
B.                      \[h=\frac{5D}{4}\]
C.             \[h=\frac{3D}{4}\]
D.           \[h=\frac{D}{4}\]
Answer» C.             \[h=\frac{3D}{4}\]


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