not enough information to support it
a projectile?
If you do not take air resistance into account, a projectile fired at 45° above horizontal will travel farther than a projectile fired at any other angle.
Do you really mean minimum distance? This would be achieved if the projectile went straight up and down, ie 90 deg from horizontal. Maximum distance would be obtained at 45 deg to horizontal.
9.8 meters per second
The vertical component of the projectile's motion is uniformly accelerated, no matter what the angle of launch was.
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45 degrees to the horizontal will give the maximum flight time for a projectile. If a projectile was fired at 90 degrees to the horizontal, (straight upwards) the projectile will go straight upwards (ignoring the shape, form and aerodynamic properties of the projectile). Likewise if you were to fire a projectile at 0 degrees to the horizontal, the projectile would follow said course, IF gravity was not in effect; a projectile needs some form of vertical velocity to overcome gravity. Hence why 45 degrees will give you the longest distance and consequently flight time.
Projectile, bullet
a projectile?
The rocket powered projectile does not have to be in a gun.
If you do not take air resistance into account, a projectile fired at 45° above horizontal will travel farther than a projectile fired at any other angle.
Do you really mean minimum distance? This would be achieved if the projectile went straight up and down, ie 90 deg from horizontal. Maximum distance would be obtained at 45 deg to horizontal.
It's called a trajectory.
a parabola
9.8 meters per second
It has happened. During the American Civil War, a Union rifleman fired his rifle, and the projectile collided with the projectile fired by a Confederate rifleman - in the barrel of the Confederate's rifle. IIRC, that rifle was displayed in the Museum of American History.
The vertical component of the projectile's motion is uniformly accelerated, no matter what the angle of launch was.