[" 30.A particle of mass "m" is projected with a velocity "v" making "],[" an angle of "45^(@)" with the horizontal.The magnitude of "],[" the angular momentum of the projectile about the point "],[" of projection when the particle is at its maximum height "],[h" is "],[[" (a) zero "," (b) "(mv^(3))/(4sqrt(2)g)" ,"(omega)/(" (d) ")" ,"(1)/(" ( "))" ,"],[" (c) "(mv^(3))/(sqrt(2)g)," (d) "m sqrt(8gh^(3))]]