A particle is projected from a point $A$ with velocity $u\sqrt 2$ at an angle of $45^o$ with horizontal as shown in fig. It strikes the plane $BC$ at right angles. The velocity of the particle at the time of collision is
A particle is projected from a point $A$ with velocity $u\sqrt 2$ at an angle of $45^o$ with horizontal as shown in fig. It strikes the plane $BC$ at right angles. The velocity of the particle at the time of collision is
- A
$\frac{{\sqrt 3 u}}{2}$
- B
$\frac{u}{2}$
- C
$\frac{{2u}}{{\sqrt 3 }}$
- D
$u$
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