Space Engineers: Gravity "Railgun" Launcher
shooting a 5000kg stone went through 16 layers of heavy steel plating. To give comparison Jupiter has a surface gravitational force 2.53 times Earth's. Here the force is 60 times Earth's just at the entry chamber. Pretty sure I'd long be dead, even if the jet pack was somehow strong enough to keep me from slamming into the side of the ship. 0/10 would not be an effective means of transport IRL.
Too much space. -IGN