Problem: A cannon fires a cannonball from the top of a wall at a speed of 38.77 m/s and an angle of 32.06 degrees from the horizontal. A cannonball that was accidentally dropped from the top of the castle hits the water below in 1.78 s.
1- What is the horizontal distance from the wall where the fired cannonball hits the ground?
I know the correct answer but explain how to get this answer for above problem!