Question

A ball is projected from the ground at an angle of 45 with the horizontal surface it reaches a maximum height of 120m and returns to the ground

Answer 1

angle 45 is the angle of elevation...range is maxx when the angle of elevation in 45......it is a model under constant acceleration...or popularly called motion under gravity or projectile motion...as mentioned 120m is the maximum highest achieved by the body.,.
...here the horizontal component is constant....but not the vertical component ....hope it was helpful...