Someone please teach these people to shoot straight.

[The Lone Gunman]

Even from submarine from underwater? Arty round also leaves with its own power by the way - you know that explosion that takes place in its shell?

You realy are being an arse today arent you.
The power is in the shell which stays behind, or hadnt you noticed. It also requires a "gun" to launch it from. Missiles have their own fuel and may be "launched" without any guiding device (not necessarily accurately).

[The Master]

What about that rifle that can fire around corners?

[AtW]

You realy are being an arse today arent you.

What about these 155 mm howitzers ammo: http://www.fas.org/man/dod-101/sys/land/155.htm

Specifically: XM 982: http://www.fas.org/man/dod-101/sys/land/m982-155.htm

I quote: "Similiar to the M483A1 with the addition of a rocket motor to further increase the effective range, and with options to increase delivery accuracy."

So, when howitzer fires that round, does it stop straight firing?

[AtW]

More importantly, what about catapults, are they also straight shooting?

To help you visualise it please see picture below.

[The Lone Gunman]

tWatY: FYI. The OP is about being able to shoot straight. This means hitting what you are aiming at in the first place. Not about the trajectory or the power source of the weapon.
All non-guided weapons could be considered to be shot and therefore have an implied straight (see definition above).

[AtW]

All non-guided weapons could be considered to be shot and therefore have an implied straight (see definition above).

Is catapult shown above a straight shooting weapon or not, simple question, please give simple answer: yes or no.

[The Lone Gunman]

I would like to refer the idiot in the corner to the answer given earlier.

Learn to speak, read and understand English.

[AtW]

Learn to speak, read and understand English.

Well, I asked a very simple question supported by picture to make it understood easier, let me repeat it: in your own view can catapult shown above shoot straight, yes or no?

[Fungus]

Bullets also drop down with distance, just like tank shells - the difference is that tanks and rifles are generally shot straight or horisontally, but mortars, howitzers are very different in this respect - they are fundamentally designed NOT to shoot horisontally, but with high angle instead.

As someone said, have you lot got something against gravity? Isaac Newton didn't get a headache for nothing you know? (Well, the falling apple story is most probably legend anyway, a product of his Mandelsonian spin machine.)

Anyone heard of a ballistic trajectory? Tanks do not fire straight. The rounds follow a ballistic trajectory. Same with a rifle for long range.

[Fungus]

Is catapult shown above a straight shooting weapon or not, simple question, please give simple answer: yes or no.

You might know didly squat about search engines, but you are right here.