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1.) if the nozzle is pointing at an angle of 40 Degrees above horizontal, how long does it take for the water to travel from the nozzle to the wall? 0.33s (it's correct, no need to check)

2.) At what height above the nozzle does the water hit the wall? 2.8 m ( this is also correct)

ok, i'm stuck on the third question....

3.) If the angle of the nozzle is changed to maximize the height of the water of the wall, what height above the nozzle does the water hit the wall?

The thing i dont understand is finding the angle of the nozzle when it's changed to the maximize height of the water. can someone help me?