An athletic trainer is most concerned with which of the following? conditioning programs

athletic techniques

O nutrition programs

injury treatments

50 inches should be the resultant vector

graph question answered .. you think better when you are relaxed and happy

force tends to be low and long diustance masses are high

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