A body is allowed to slide down a fricti...

A body is allowed to slide down a frictionless track from rest position at its top under gravity. The track ends in a circular loop of diameter `D`. Then, the minimum height of the inclined track (in terms of `D`) so that it may complete successfully the loop is

`h = (5D)/(2)`

`h = (5D)/(4)`

`h = (3D)/(4)`

`h = (D)/(4)`

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