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Points P, Q and R are in a vertical line...

Points P, Q and R are in a vertical line such that `PQ=QR`. A ball at P is allowed to fall freely with zero initial speed. The ratio of the times of descent through PQ and OR is

A

`1:(sqrt2+1)`

B

`1:(sqrt2-1)`

C

`1:2`

D

`1:sqrt2`

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