A body initially rest and sliding along ...

A body initially rest and sliding along a frictionless trick from a height `h` (as shown in the figure) just completes a vertical circle of diameter `AB = D`. The height `h` is equal to

`7/5D`

`3/2D`

`5/4D`

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The correct Answer is:

To complete verticle circle minimum velocity required at lowest point of circle is `sqrt(5gr)` So by conservation of energy
`mgh=1/2mv^2` r=`D/2`
mgh=`1/2mxx5g(D)/(2)`
h=`(5D)/(4)`

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