physics
posted by Anonymous .
An artillery shell is fired at an angle of 45.3◦ above the horizontal ground with an initial speed of 1710 m/s.
The acceleration of gravity is 9.8 m/s2 .
Find the total time of flight of the shell,
neglecting air resistance.
Answer in units of min.

Look at the vertical...that is what time it is in the air.
Hf=Hi+vivert*time 1/2 g time^2
solve for time
vivert=1710*sin45.3 m/s 
An artillery shell is fired at an angle of 67.1◦ above the horizontal ground with an initial speed of 1580 m/s.
The acceleration of gravity is 9.8 m/s2 .
Find the total time of flight of the shell, neglecting air resistance.
Answer in units of min.