A body initially at rest and sliding along a frictionless track from a height \( h \) (as shown ...

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A body initially at rest and sliding along a frictionless track from a height \( h \) (as shown in the figure) just completes a vertical circle of diameter \( A B=D \). The height \( h \) is equal to
[NEET 2018]
(a) \( \frac{3}{2} D \)
(b) \( D \)
(c) \( \frac{7}{5} D \)
(d) \( \frac{5}{4} D \)
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