Paintball guns were originally developed to mark trees for logging. A forester aims his gun directly at a knothole in a tree that is 8.0 m above the gun. The base of the tree is 18 m away. The speed of the paintball as it leaves the gun is 50 m/s.

f=ma newton

f=100x2.5=250n

i think it would be 5

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