A particle is projected from a point A w...

A particle is projected from a point `A` with velocity `sqrt(2)u` an angle of `45^(@)` with horizontal as shown in figure. It strikes the plane `BC` at right angles. The velocity of the particle at the time of collision is

`(sqrt(3)u)/2`

`u/2`

`(2u)/(sqrt(3))`

`u`

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