Question

definition of range time of flight and angle of projection

Answer 1

Time of flight: It is the total time for which the projectile remains in air. We know, at the end of time of flight, the projectile reaches the point on the ground. So, vertical height gained by the y = 0.
angle of projection means that the Vertical Plane is behind the object and the Horizontal Plane is underneath the object.

Answer 2

i don't know the answer of this question