question b) for first (b) Briefly describe the change of heigth of the projectile within the first 9 seconds.?

Answer 1

This question has a description that goes before it. Without that the question is meaningless.

Answer 2

The change of height of your projectile is:
Δy(t) = vsinθt - ½gt^2
where v is your initial speed in meters per second, θ is the angle that your projectile is fired from the horizonal, t is the time in seconds, and g is the gravitational acceleration (9.8 m/s^2 on Earth). Without giving me any initial conditions, it is hard to describe the behavior of the projectile.

Answer 3

Insufficient data.