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Two inclined planes OA and OB of inclina...

Two inclined planes `OA` and `OB` of inclinations `alpha` and `beta` equal to `30^(@)` are as shown in the figure. A particle is projected at an angle of `90^(@)` with plane `OA` from point `A` and it strikes the plane `OB` at point `B` normally. Then find the speed of projection `u` in m/s.
(Given that `OA=OB=20cm` and `g=10m//s^(2)`)

A

`2`

B

`5`

C

`4`

D

`6`

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The correct Answer is:
A
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