A particle is projected at an angle 60^@...

A particle is projected at an angle `60^@` from Horizon from ground with speed u. after some time it collides with a wall inclined at an angle `30^@` from horizon. At the time of collision velocity of particle is perpendicular to the wall. Find speed of the particle at the time of collision :-

`u`

`u/sqrt3`

`(2u)/sqrt3`

`2u`

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