Could you work out this problem for me with all the details/step by step? I have done it wrong 3 times now and am now so flustered that I need to be walked through the steps and get the answer.

Thank you.

1. Aprojectileisfiredofftheedgeofacliff,withinitialvelocity componentsofVox=30m/sandVoy = 100 m/s. The projectile rises, then falls into the sea at point P. The time of flight of theprojectile is 25.0 s.What is the velocity and angle of the projectile at 20 s?

In the above question, what is the maximum above the sea level the projectile reaches and what is the magnitude of "D"?