Kinematics 1

The trajectory of a projectile in a vertical plane is $$y=ax-b{ x }^{ 2 }$$ , where $$a$$ and $$b$$ are constants, and $$x$$ and $$y$$ are respectively the horizontal and vertical distance of the projectile from the point of projection. What is the maximum height attained and the angle of projection from the horizontal?

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