Yes
The AR lower receivers are for Airsoft guns.
They are of lower quality then most manufactures.
In theory they should, and they will if you are only using guns under 300ish fps, but I would recomend getting either a full paintball mask, or goggles that are rated for airsoft (like flak jags) and a lower half face mask (like the lower half iron face). This is becuase a bb traveling at around 340ish fps can easily chip your tooth and possible break glasses/goggles that are not meant for airsoft.
BB guns and airsoft guns differ in power and accuracy. BB guns typically have higher power and velocity, making them more suitable for hunting small game. On the other hand, airsoft guns are designed for recreational use and have lower power levels, making them safer for shooting at close range. In terms of accuracy, airsoft guns are generally more precise due to their hop-up system, which helps stabilize the trajectory of the BBs.
Velocity is often indivated by the lower case letter "v"
The fraction of force affecting the ball determines its acceleration and, consequently, its velocity. A higher fraction of force results in greater acceleration and a higher velocity, while a lower fraction results in less acceleration and a lower velocity.
Not necessarily, but the frequencies are different.
No it justs refracts further
To reduce the velocity of a bullet in air, you can increase the drag force acting on the bullet by using a heavier or more aerodynamically shaped bullet, or by increasing the air density (e.g., shooting at higher altitudes). Additionally, you can decrease the initial muzzle velocity of the bullet by using a lower-powered cartridge or firearm.
Positive acceleration.
The marble has lower drag so its terminal velocity would be greater. Each has its own terminal velocity.
You can play airsoft in any weather. Airsplat.com has Ghillie suits and vests to keep you warm in the cold so you can play airsoft at anytime of year. Check out Airsplat.com for airsoft accessories and guns.