A spring-loaded toy gun projects a 5.0 g nerf pellet horizontally. The spring constant is 8.5 N/m, the barrel of the gun is 12 cm long, and a constant frictional force of 0.029 N exists between the barrel and the nerf pellet. If the spring is compressed 5.5 cm for this launch, determine the speed (in m/s) of the pellet as it leaves the barrel. (Assume the pellet is in contact with the barrel for the full length of the barrel.)

do you have a formula possibly

a.   mass number from atomic number

it's when something is going so fast it makes a loud noise, breaking the sound barrier, for example: a jet makes a loud noise, not only cause of the jet but because they reached a point where they went so fast that you can year the noise from various parts, kinda like a police car, lets say the car was going   so fast that you hear the siren of the cop car right next to you, but the car is probably a mile a way, it's cos the siren was next to you a few seconds if you understand me

the answer to this is proletariats.

hope this : )