In general, it is not so much a matter of "figuring it out" as it is measuring it. A device called a chronograph actually measures the speed of a bullet in flight. Based on that speed, and a figure called the ballistic coefficent, you can then predict approximately the speed, drop, and energy at various distances.
In a snail, YES. In a bullet, NO!
The average bullet speed can vary depending on the type of bullet and the firearm it is fired from. However, typical bullet speeds can range from about 800 feet per second (fps) to 3000 fps. High-powered rifles can have bullet speeds exceeding 3000 fps.
65 FPS
Most match grade .22 runs at about 1050 fps. Various bullet weights and powder charges will produce different velocities, but figure from about 1000-1300 fps.
The muzzle velocity of a Winchester .30-30 varies depending on the load and the bullet, but we can ball park things a bit. With a "standard" load and a 110 grain bullet, it's about 2,690 fps (feet per second). For a 130 grain bullet, about 2,500 fps. A 150 grain bullet cuts it to about 2,400 fps. With the 170 grain bullet, it drops to about 2,200 fps.
Higher fps and low grain = longer more acurate shot lower fps higher grain = power ful slow bullet
About 3,000 fps
4000 fps or more.
a few hundred FPS to multiple thousands of FPS depending on the exact weapon.
That is sort of like asking how many miles per hour does 100 horsepower equal. Ft lbs is energy, and FPS is speed. There IS a formula to calculate the energy (in foot lbs) of a bullet, but to use that, you need to know SPEED in FPS, and WEIGHT (in grains) of the bullet. A 40 grain bullet at 1000 fps is pretty weak. A 400 gr bullet at 1000 fps can drop a moose.
It depends on the thickness of the glass and the muzzle energy of the bullet, not just the velocity.
The DE was made in several different calibers. The speed of the bullet (FPS) depends on which cartridge.