From somewhere around 20 degrees up to about 60 degrees, a bullet will actually speed up to a point because it has the velocity pushing it forward, as well as gravity pulling it down. Of course terminal velocity comes into play after that, because after around 60 degrees you're now shooting against gravity so the bullet will slow down until it reaches the top of its trajectory arc than keep a somewhat constant until it hits the ground.
Not exactly.
When ever any object is unsupported, i.e the instant the bullet leaves the barrel, it begins to drop due to gravity at the rate of 9.8 meters /sec (@sea level,,not factoring in air resistance). after 1 second it has dropped 9.8 meters, after 2 seconds 19.6 meters and so on.
To compensate for this drop, we elevate the barrel to compensate, trading some horizontal force for an upward vertical force .
?we sight in @ 50 yards,100 or ?instead of point blank?. it averages the flight so accuracy is tighter over a wider range. say we sight in at 100 yards, the bullet rises then falls to hit the 100 yard.At 50 yards (100 yard sight-in) you will hit higher than you aim, 150 yards (100 yard sight in) will hit lower
Initial speed of the round has the greatest influence on how much/little it drops/we compensate since flight time to impact will shorten with a faster speed.
Gravity works in the down direction, while air resistance imposes itself against you in any direction. when working against gravity till they are equal, this is "terminal velocity", a fraction of the speed which typically exist when the bullet leaves the barrel. air resistance varies on bullet shape, and whether tumbling or stable).I'm leaving some other stuff out.
So if you shoot straight up in the air, the moment it leaves the barrel it begins to slow! down (since the expanding gases no longer push the bullet); due to gravity ( a constant downward force) and air resistance (which is greatest at the highest velocity) till it runs out of inertia (at the apex) then starts to accelerate back down due to gravity, with air resistance becoming a growing factor working against gravity till the two equal (terminal velocity) .
lethality depends on impact velocity and mass( kinetic energy)
I wouldn't want to be hit by any size bullet from any angle at any speed. especially me noggin.