Answer:
It will increase in speed
Explanation:
Answer:38.675 m/s
Explanation:

t=4.2 s

Solving in x direction


ucos25=25
u=27.584 m/s
Initial velocity in vertical direction usin25
Let h be the height of Rooftop

h=37.47 m
Therefore final vertical velocity is 
=29.51 m/s
Final Resultant velocity


Answer:

Therefore, highest point that the cannon ball reaches is 168.7m
Explanation:
the cannon is fired at an angle 30 o to the horizonatal with a speed of 155 m/s
highest point that the cannon ball reaches?

g = 9.8m/s2

Therefore, highest point that the cannon ball reaches is 168.7m