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In figure ABCDE is a channel in the vert...

In figure ABCDE is a channel in the vertical plane, part BCDE being circular with radius r. A ball is released from A and slides without friction and without rolling. It will complete the loop path when

A

`hgt5r//2`

B

`hlt5r//2`

C

`hlt2r//5`

D

`hgt2r//5`

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