A Mortar shell fired with an angle of elevation of 52 degrees has a range of 2.1 km. Neglecting air resistance determine:
1 - The time of the flight
2 - The shell's initial velocity
3 - The shell's range and height 30s after firing
4 - The other range at which the height was the same as calculated in part (3) above.
Quadratic equations are applies to the flight of a mortar shell.