Recently I decided to combine three of my favorite things, physics, machines that propel things, and videogames. The game in question: Space engineers. Machine in question: A device of my own creation that abuses the marvel of artificial gravity to accelerate a projectile at high speeds. The physics? How much energy can one of my cannons deliver in the form of kinetic energy. After building a small cannon for testing and dusting off my physics textbook I came up with these variables. Mass of the projectile: 20 tons or 18143.695 kilograms. Acceleration due to the gravitational forces I've enslaved: 1177.20 m/s^2 Total distance of acceleration: 125 meters. After a bit more math I found that the final velocity of the slightly unrealistic 20 ton shell is 542.4942396 m/s. If needed I can put a link to the thread I found my velocity from acceleration and distance work on. Now using the lovely 1/2mv^2 I came to a kinetic energy of 2,669,844,719 j, or 2.7 mj. Now here is my problem. My mathematically inclined brain says that's a lot. But physics brain is saying that's not all that much energy. How much energy is 2.7 megajoules? Is there any good real world examples of something with this kind of energy? Many thanks in advance.