Question

 

Projectile motions Plzz help!!!!?

Two inclined planes OA and OB intersect in a horizontal plane having their inclinations α and β respectively as shown in the figure in the link given below. A particle is projected from point P with velocity 'u' along a direction perpendicular to plane OA. The particle strikes plane OB perpendicularly at Q.1) If α = 30 degrees and β = 30 degrees find the time of flight from P to Q. 
2)If α = 30 degrees and β = 30 degrees and 'a'= 4.9 m, find the initial velocity of projection.
Joshi sir comment

component of initial velocity along OB = ucos30

component of final velocity along OB = 0

component of g along OB = -gsin30

now use v = u + at

in second part clearly explain "a" 

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