Question

Compute for the maximum height to be reached by the cannon

ball.

Answer 1

The maximum height depends on the initial speed (see https://courses.lumenlearning.com/boundless-physics/chapter/projectile-motion/):

$$h = \dfrac{u_0^2\sin^2\theta}{2g}$$

where $u_0$ is the initial speed, $\theta$ is the launch angle, $g$ is the gravitational acceleration.