Solve the given parts of following problem:
Problem: You launch a canon ball at an angle of 15 degrees above horizontal toward a target 1600 meters horizontally away from you. The target is below your location. The cannon ball hits the target 75 seconds after launch.
Part A: What is the speed of the cannon all as it leaves the cannon?
Part B: What is the speed of the cannon ball at the moment it first strikes the target?
I need help to find the speed of the cannon all as it leaves the cannon.