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Two particles are simultaneously project...

Two particles are simultaneously projected in the horizontal direction from a point P at a certain height. The initial velocities of the particles are oppositely directed to each other and have magnitude v each. The separation between the particles at a time when their position vectors (drawn from the point P are mutually perpendicular, is

A

`v^2/2g`

B

`v^2/g`

C

`4v^2/g`

D

`2v^2/g`

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