Equation of trajectory of a projectile is given by y = –x^{2} + 10x where x and y are in meters and x is along horizontal and y is vertically upward and particle is projected from origin. Then which of the following options is/are correct : (g = 10 m/s^{2})

(A) initial velocity of particle is √505 m/s

(B) horizontal range is 10 m

(C) maximum height is 25 m

(D) angle of projection with horizontal is tan^{–1} (5)