Projectile motion is the motion of an object that is projected into the air and then moves under the influence of gravity alone.
To solve for initial velocity, you need to know the angle of projection, the time of flight, and the distance traveled. You can then use the equations of projectile motion to solve for the initial velocity.
No, the angle of projection must be between 0 and 90 degrees. An angle of 0 degrees would result in the projectile not moving at all, while an angle of 90 degrees would result in the projectile moving straight up and then falling straight down.
The time of flight can be found by using the equation t = 2 * (V * sin(A)) / g, where V is the initial velocity, A is the angle of projection, and g is the acceleration due to gravity (9.8 m/s^2).
The initial velocity, angle, time, and distance are all related in projectile motion through the equations of motion. By knowing any three of these variables, you can solve for the fourth using the appropriate equation.