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In a fixed quarter circular track of rad...

In a fixed quarter circular track of radius R which lies in a vertical plane, a block is released from point A and it leaves the path at point B. The radius of curvature of its trajectory when it just leaves the path will be

A

R

B

`( R )/( 4)`

C

`( R )/( 2)`

D

None of these

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The correct Answer is:
C
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