A body is thrown from the surface of the Earth at an angle to the horizontal with

Question:

A body is thrown from the surface of the Earth at an angle α to the horizontal with the initial velocity vo. assuming the air drags to be negligible, find:
(a) The time of motion;
(b) The maximum height of ascent and the horizontal range; at what value of the angle a they will be equal to each other;
(c) The equation of trajectory y (x), where y and x are displacements of the body along the vertical and the horizontal respectively;
(d) The curvature radii of trajectory at its initial point and at its peak.